Oct. 10 started out as a normal day. People of all kinds, mostly young, assembled slowly in front of the train station in Ankara to participate in the "Labor, Peace and Democracy" rally organized by the pro-Kurdish Peoples' Democratic Party (HDP). Also attending were members of the Confederation of Revolutionary Labor Unions, other leftist labor unions and professional nongovernmental organizations.

At 10:04 a.m., two suicide bombers, separated by about 50 yards and three seconds, detonated their explosive-packed vests that were equipped with roughly 20-30 pounds of explosives, reinforced with RDX and steel balls to increase fragmentation. The human toll was high: According to the latest official data from the government, at least 97 were killed and 160 sent to hospitals, with 65 in serious condition.

Security officials are certain the attack was carried out by live bombers because there were no craters where the blasts took place, as there would be if a car or parcel bomb had been used. Also, the fragments were particularly deadly. Investigators are focusing on identifying the attackers using evidence from the scene, coroner’s reports, closed-circuit TV recordings and cellular telephone records. But already the media is carrying reports, attributed to police, that one of the bombers allegedly was Yunus Emre Alagoz.

Who is Yunus Emre Alagoz? He was a good friend of Orhan Gonder, who on June 5 allegedly set off a bomb at HDP’s electoral rally at Diyarbakir, causing casualties.