
MADRID, SPAIN - MARCH 11: People place flowers on trees to commemorate the 193 terror victims, who lost their lives during the terrorist attack at 4 different suburban train on March 11 2004, at El Retiro Park in Madrid, Spain on March 11, 2019. ( Burak Akbulut - Anadolu Agency )

MADRID, SPAIN - MARCH 11: Leader of Ciutadans (Citizens) political party Albert Rivera puts flowers on a tree to commemorate the 193 terror victims, who lost their lives during the terrorist attack at 4 different suburban train on March 11 2004, at El Retiro Park in Madrid, Spain on March 11, 2019. ( Burak Akbulut - Anadolu Agency )

MADRID, SPAIN - MARCH 11: Popular Party (PP) Pablo Casado Blanco puts flowers on a tree to commemorate the 193 terror victims, who lost their lives during the terrorist attack at 4 different suburban train on March 11 2004, at El Retiro Park in Madrid, Spain on March 11, 2019. ( Burak Akbulut - Anadolu Agency )

MADRID, SPAIN - MARCH 11: People place flowers on trees to commemorate the 193 terror victims, who lost their lives during the terrorist attack at 4 different suburban train on March 11 2004, at El Retiro Park in Madrid, Spain on March 11, 2019. ( Burak Akbulut - Anadolu Agency )

MADRID, SPAIN - MARCH 11: People place flowers on trees to commemorate the 193 terror victims, who lost their lives during the terrorist attack at 4 different suburban train on March 11 2004, at El Retiro Park in Madrid, Spain on March 11, 2019. ( Burak Akbulut - Anadolu Agency )

MADRID, SPAIN - MARCH 11: People place flowers on trees to commemorate the 193 terror victims, who lost their lives during the terrorist attack at 4 different suburban train on March 11 2004, at El Retiro Park in Madrid, Spain on March 11, 2019. ( Burak Akbulut - Anadolu Agency )