ANKARA, TURKEY - OCTOBER 10: A group of protesters attack a police vehicle following an explosion close to Ankara's main train station on October 10, 2015 in Ankara, Turkey. An explosion hit Ankara train station Saturday morning leaving dozens of people dead and injured, as many people gathered outside the station for a demonstration to be held in nearby at Sihhiye Square. (Muammer Tan - Anadolu Agency)

ANKARA, TURKEY - OCTOBER 10: A view of the site of an explosion close to Ankara's main train station on October 10, 2015 in Ankara, Turkey. An explosion hit Ankara train station Saturday morning leaving dozens of people dead and injured, as many people gathered outside the station for a demonstration to be held in nearby at Sihhiye Square. (Volkan Furuncu - Anadolu Agency)

ANKARA, TURKEY - OCTOBER 10: A view of the site of an explosion close to Ankara's main train station on October 10, 2015 in Ankara, Turkey. An explosion hit Ankara train station Saturday morning leaving dozens of people dead and injured, as many people gathered outside the station for a demonstration to be held in nearby at Sihhiye Square. (Volkan Furuncu - Anadolu Agency)

ANKARA, TURKEY - OCTOBER 10: People carry a wounded man at the site of an explosion close to Ankara's main train station on October 10, 2015 in Ankara, Turkey. An explosion hit Ankara train station Saturday morning leaving dozens of people dead and injured, as many people gathered outside the station for a peace demonstration to be held in nearby at Sihhiye Square. (Erçin Top - Anadolu Agency)

ANKARA, TURKEY - OCTOBER 10: People are seen at the site of an explosion close to Ankara's main train station on October 10, 2015 in Ankara, Turkey. An explosion hit Ankara train station Saturday morning leaving dozens of people dead and injured, as many people gathered outside the station for a peace demonstration to be held in nearby at Sihhiye Square. (Erçin Top - Anadolu Agency)

ANKARA, TURKEY - OCTOBER 10: A woman reacts at the site of an explosion close to Ankara's main train station on October 10, 2015 in Ankara, Turkey. An explosion hit Ankara train station Saturday morning leaving dozens of people dead and injured, as many people gathered outside the station for a peace demonstration to be held in nearby at Sihhiye Square. (Erçin Top - Anadolu Agency)

ANKARA, TURKEY - OCTOBER 10: A man reacts at the site of an explosion close to Ankara's main train station on October 10, 2015 in Ankara, Turkey. An explosion hit Ankara train station Saturday morning leaving dozens of people dead and injured, as many people gathered outside the station for a peace demonstration to be held in nearby at Sihhiye Square. (Erçin Top - Anadolu Agency)

ANKARA, TURKEY - OCTOBER 10: A group of protesters attack a police officer following an explosion close to Ankara's main train station on October 10, 2015 in Ankara, Turkey. An explosion hit Ankara train station Saturday morning leaving dozens of people dead and injured, as many people gathered outside the station for a peace demonstration to be held in nearby at Sihhiye Square. (Erçin Top - Anadolu Agency)

ANKARA, TURKEY - OCTOBER 10: Wounded at the site of an explosion close to Ankara's main train station on October 10, 2015 in Ankara, Turkey. An explosion hit Ankara train station Saturday morning leaving dozens of people dead and injured, as many people gathered outside the station for a peace demonstration to be held in nearby at Sihhiye Square. (Ege Gürün - Anadolu Agency)

ANKARA, TURKEY - OCTOBER 10: A woman reacts at the site of an explosion close to Ankara's main train station on October 10, 2015 in Ankara, Turkey. An explosion hit Ankara train station Saturday morning leaving dozens of people dead and injured, as many people gathered outside the station for a peace demonstration to be held in nearby at Sihhiye Square. (Ege Gürün - Anadolu Agency)

ANKARA, TURKEY - OCTOBER 10: A wounded man sits near the site of an explosion close to Ankara's main train station on October 10, 2015 in Ankara, Turkey. An explosion hit Ankara train station Saturday morning leaving dozens of people dead and injured, as many people gathered outside the station for a peace demonstration to be held in nearby at Sihhiye Square. (Ege Gürün - Anadolu Agency)

ANKARA, TURKEY - OCTOBER 10: People are seen at the site of an explosion close to Ankara's main train station on October 10, 2015 in Ankara, Turkey. An explosion hit Ankara train station Saturday morning leaving dozens of people dead and injured, as many people gathered outside the station for a peace demonstration to be held in nearby at Sihhiye Square. (Erçin Top - Anadolu Agency)

ANKARA, TURKEY - OCTOBER 10: People react at the site of an explosion close to Ankara's main train station on October 10, 2015 in Ankara, Turkey. An explosion hit Ankara train station Saturday morning leaving dozens of people dead and injured, as many people gathered outside the station for a peace demonstration to be held in nearby at Sihhiye Square. (Erçin Top - Anadolu Agency)

ANKARA, TURKEY - OCTOBER 10: People are seen at the site of an explosion close to Ankara's main train station on October 10, 2015 in Ankara, Turkey. An explosion hit Ankara train station Saturday morning leaving dozens of people dead and injured, as many people gathered outside the station for a peace demonstration to be held in nearby at Sihhiye Square. (Erçin Top - Anadolu Agency)

ANKARA, TURKEY - OCTOBER 10: People are seen at the site of an explosion close to Ankara's main train station on October 10, 2015 in Ankara, Turkey. An explosion hit Ankara train station Saturday morning leaving dozens of people dead and injured, as many people gathered outside the station for a peace demonstration to be held in nearby at Sihhiye Square. (Erçin Top - Anadolu Agency)

ANKARA, TURKEY - OCTOBER 10: People are seen at the site of an explosion close to Ankara's main train station on October 10, 2015 in Ankara, Turkey. An explosion hit Ankara train station Saturday morning leaving 30 people dead and 126 injured, as many people gathered outside the station for a peace demonstration to be held in nearby at Sihhiye Square. (Binnur Ege Gürün - Anadolu Agency)

ANKARA, TURKEY - OCTOBER 10: People carry a wounded woman at the site of an explosion close to Ankara's main train station on October 10, 2015 in Ankara, Turkey. An explosion hit Ankara train station Saturday morning leaving 30 people dead and 126 others injured, as many people gathered outside the station for a peace demonstration to be held in nearby at Sihhiye Square. (Volkan Furuncu - Anadolu Agency)

ANKARA, TURKEY - OCTOBER 10: People are seen at the site of an explosion close to Ankara's main train station on October 10, 2015 in Ankara, Turkey. An explosion hit Ankara train station Saturday morning leaving 30 people dead and 126 others injured, as many people gathered outside the station for a peace demonstration to be held in nearby at Sihhiye Square. (Volkan Furuncu - Anadolu Agency)

ANKARA, TURKEY - OCTOBER 10: A woman reacts at the site of an explosion close to Ankara's main train station on October 10, 2015 in Ankara, Turkey. An explosion hit Ankara train station Saturday morning leaving 30 people dead and 126 others injured as many people gathered outside the station for a peace demonstration to be held in nearby at Sihhiye Square. (Okan Özer - Anadolu Agency)

ANKARA, TURKEY - OCTOBER 10: People react at the site of an explosion close to Ankara's main train station on October 10, 2015 in Ankara, Turkey. An explosion hit Ankara train station Saturday morning leaving 30 people dead and 126 others injured as many people gathered outside the station for a peace demonstration to be held in nearby at Sihhiye Square. (Okan Özer - Anadolu Agency)

ANKARA, TURKEY - OCTOBER 10: A woman reacts at the site of an explosion close to Ankara's main train station on October 10, 2015 in Ankara, Turkey. An explosion hit Ankara train station Saturday morning leaving 30 people dead and 126 others injured as many people gathered outside the station for a peace demonstration to be held in nearby at Sihhiye Square. (Okan Özer - Anadolu Agency)

ANKARA, TURKEY - OCTOBER 10: A man reacts at the site of an explosion close to Ankara's main train station on October 10, 2015 in Ankara, Turkey. An explosion hit Ankara train station Saturday morning leaving 30 people dead and 126 others injured as many people gathered outside the station for a peace demonstration to be held in nearby at Sihhiye Square. (Okan Özer - Anadolu Agency)

ANKARA, TURKEY - OCTOBER 10: People react at the site of an explosion close to Ankara's main train station on October 10, 2015 in Ankara, Turkey. An explosion hit Ankara train station Saturday morning leaving 30 people dead and 126 others injured as many people gathered outside the station for a peace demonstration to be held in nearby at Sihhiye Square. (Okan Özer - Anadolu Agency)

ANKARA, TURKEY - OCTOBER 10: People react at the site of an explosion close to Ankara's main train station on October 10, 2015 in Ankara, Turkey. An explosion hit Ankara train station Saturday morning leaving 30 people dead and 126 others injured, as many people gathered outside the station for a peace demonstration to be held in nearby at Sihhiye Square. (Erçin Top - Anadolu Agency)

ANKARA, TURKEY - OCTOBER 10: People react at the site of an explosion close to Ankara's main train station on October 10, 2015 in Ankara, Turkey. An explosion hit Ankara train station Saturday morning leaving 30 people dead and 126 others injured, as many people gathered outside the station for a peace demonstration to be held in nearby at Sihhiye Square. (Erçin Top - Anadolu Agency)

ANKARA, TURKEY - OCTOBER 10: People react at the site of an explosion close to Ankara's main train station on October 10, 2015 in Ankara, Turkey. An explosion hit Ankara train station Saturday morning leaving 30 people dead and 126 others injured, as many people gathered outside the station for a peace demonstration to be held in nearby at Sihhiye Square. (Erçin Top - Anadolu Agency)

ANKARA, TURKEY - OCTOBER 10: A wounded man sits at the site of an explosion close to Ankara's main train station on October 10, 2015 in Ankara, Turkey. An explosion hit Ankara train station Saturday morning leaving 30 people dead and 126 others injured, as many people gathered outside the station for a peace demonstration to be held in nearby at Sihhiye Square. (Erçin Top - Anadolu Agency)

ANKARA, TURKEY - OCTOBER 10: A man reacts at the site of an explosion close to Ankara's main train station on October 10, 2015 in Ankara, Turkey. An explosion hit Ankara train station Saturday morning leaving 30 people dead and 126 others injured, as many people gathered outside the station for a peace demonstration to be held in nearby at Sihhiye Square. (Volkan Furuncu - Anadolu Agency)

ANKARA, TURKEY - OCTOBER 10: People react at the site of an explosion close to Ankara's main train station on October 10, 2015 in Ankara, Turkey. An explosion hit Ankara train station Saturday morning leaving 30 people dead and 126 others injured, as many people gathered outside the station for a peace demonstration to be held in nearby at Sihhiye Square. (Volkan Furuncu - Anadolu Agency)

ANKARA, TURKEY - OCTOBER 10: A man reacts at the site of an explosion close to Ankara's main train station on October 10, 2015 in Ankara, Turkey. An explosion hit Ankara train station Saturday morning leaving 30 people dead and 126 others injured, as many people gathered outside the station for a peace demonstration to be held in nearby at Sihhiye Square. (Volkan Furuncu - Anadolu Agency)

ANKARA, TURKEY - OCTOBER 10: People gather at the site of an explosion close to Ankara's main train station on October 10, 2015 in Ankara, Turkey. (Muammer Tan - Anadolu Agency)

ANKARA, TURKEY - OCTOBER 10: People are seen at the site of an explosion close to Ankara's main train station on October 10, 2015 in Ankara, Turkey. A bomb exploded near Ankara's main train station where hundreds of people gathered to take part in a rally on Sunday. (Muammer Tan - Anadolu Agency)

ANKARA, TURKEY - OCTOBER 10: A view of the site of an explosion close to Ankara's main train station on October 10, 2015 in Ankara, Turkey. An explosion hit Ankara train station Saturday morning leaving dozens of people dead and injured, as many people gathered outside the station for a demonstration to be held in nearby at Sihhiye Square. (Volkan Furuncu - Anadolu Agency)