CORSICANA, USA - JULY 11 : People and police officers light candles during a commemorative ceremony held for the police officer Brent Thomson, a victim of the Dallas shooting, in his hometown Corsicana, USA on July 11, 2016. His relatives, colleagues and hundreds of American people gather for him. ( Bilgin S. Şaşmaz - Anadolu Agency )

CORSICANA, USA - JULY 11 : People light candles during a commemorative ceremony held for the police officer Brent Thomson, a victim of the Dallas shooting, in his hometown Corsicana, USA on July 11, 2016. His relatives, colleagues and hundreds of American people gather for him. ( Bilgin S. Şaşmaz - Anadolu Agency )

CORSICANA, USA - JULY 11 : Police officers cry for their colleague during a commemorative ceremony held for the police officer Brent Thomson, a victim of the Dallas shooting, in his hometown Corsicana, USA on July 11, 2016. His relatives, colleagues and hundreds of American people gather for him. ( Bilgin S. Şaşmaz - Anadolu Agency )

CORSICANA, USA - JULY 11 : A commemorative ceremony held for the police officer Brent Thomson, a victim of the Dallas shooting, in his hometown Corsicana, USA on July 11, 2016. His relatives, colleagues and hundreds of American people gather for him. ( Bilgin S. Şaşmaz - Anadolu Agency )

CORSICANA, USA - JULY 11 : People light candles during a commemorative ceremony held for the police officer Brent Thomson, a victim of the Dallas shooting, in his hometown Corsicana, USA on July 11, 2016. His relatives, colleagues and hundreds of American people gather for him. ( Bilgin S. Şaşmaz - Anadolu Agency )

CORSICANA, USA - JULY 11 : A commemorative ceremony held for the police officer Brent Thomson, a victim of the Dallas shooting, in his hometown Corsicana, USA on July 11, 2016. His relatives, colleagues and hundreds of American people gather for him. ( Bilgin S. Şaşmaz - Anadolu Agency )

CORSICANA, USA - JULY 11 : Police officers light candles for their colleague during a commemorative ceremony held for the police officer Brent Thomson, a victim of the Dallas shooting, in his hometown Corsicana, USA on July 11, 2016. His relatives, colleagues and hundreds of American people gather for him. ( Bilgin S. Şaşmaz - Anadolu Agency )

CORSICANA, USA - JULY 11 : People light candles during a commemorative ceremony held for the police officer Brent Thomson, a victim of the Dallas shooting, in his hometown Corsicana, USA on July 11, 2016. His relatives, colleagues and hundreds of American people gather for him. ( Bilgin S. Şaşmaz - Anadolu Agency )

CORSICANA, USA - JULY 11 : A commemorative ceremony held for the police officer Brent Thomson, a victim of the Dallas shooting, in his hometown Corsicana, USA on July 11, 2016. His relatives, colleagues and hundreds of American people gather for him. ( Bilgin S. Şaşmaz - Anadolu Agency )

DALLAS, TX - JULY 10: Federal Bureau of Investigation (FBI) inspect the areas as people visit a growing memorial at the Dallas police department's headquarters following the deaths of five police officers on July 10, 2016 in Dallas, Texas. Five police officers were killed and seven others were injured in an ambush during a march against recent police involved shootings. ( Bilgin Sasmaz - Anadolu Agency )

DALLAS, TX - JULY 10: Federal Bureau of Investigation (FBI) dos is seen as people visit a growing memorial at the Dallas police department's headquarters following the deaths of five police officers on July 10, 2016 in Dallas, Texas. Five police officers were killed and seven others were injured in an ambush during a march against recent police involved shootings. ( Bilgin Sasmaz - Anadolu Agency )

DALLAS, TX - JULY 10: Federal Bureau of Investigation (FBI) inspect the areas as people visit a growing memorial at the Dallas police department's headquarters following the deaths of five police officers on July 10, 2016 in Dallas, Texas. Five police officers were killed and seven others were injured in an ambush during a march against recent police involved shootings. ( Bilgin Sasmaz - Anadolu Agency )

DALLAS, TX - JULY 10: Federal Bureau of Investigation (FBI) inspect the areas as people visit a growing memorial at the Dallas police department's headquarters following the deaths of five police officers on July 10, 2016 in Dallas, Texas. Five police officers were killed and seven others were injured in an ambush during a march against recent police involved shootings. ( Bilgin Sasmaz - Anadolu Agency )

DALLAS, TX - JULY 10: People visit a growing memorial at the Dallas police department's headquarters following the deaths of five police officers on July 10, 2016 in Dallas, Texas. Five police officers were killed and seven others were injured in an ambush during a march against recent police involved shootings. ( Bilgin Sasmaz - Anadolu Agency )

DALLAS, TX - JULY 10: People visit a growing memorial at the Dallas police department's headquarters following the deaths of five police officers on July 10, 2016 in Dallas, Texas. Five police officers were killed and seven others were injured in an ambush during a march against recent police involved shootings. ( Bilgin Sasmaz - Anadolu Agency )

DALLAS, TX - JULY 10: People visit a growing memorial at the Dallas police department's headquarters following the deaths of five police officers on July 10, 2016 in Dallas, Texas. Five police officers were killed and seven others were injured in an ambush during a march against recent police involved shootings. ( Bilgin Sasmaz - Anadolu Agency )

DALLAS, TX - JULY 10: People visit a growing memorial at the Dallas police department's headquarters following the deaths of five police officers on July 10, 2016 in Dallas, Texas. Five police officers were killed and seven others were injured in an ambush during a march against recent police involved shootings. ( Bilgin Sasmaz - Anadolu Agency )

DALLAS, TX - JULY 10: People visit a growing memorial at the Dallas police department's headquarters following the deaths of five police officers on July 10, 2016 in Dallas, Texas. Five police officers were killed and seven others were injured in an ambush during a march against recent police involved shootings. ( Bilgin Sasmaz - Anadolu Agency )

DALLAS, TX - JULY 10: People visit a growing memorial at the Dallas police department's headquarters following the deaths of five police officers on July 10, 2016 in Dallas, Texas. Five police officers were killed and seven others were injured in an ambush during a march against recent police involved shootings. ( Bilgin Sasmaz - Anadolu Agency )