After a series of six terrorist attacks in Paris on Friday night killed at least 129 people, investigators started searching Europe for information about the seven suicide bombers and others who may have helped plot the attacks. French investigators identified Ismaël Omar Mostefaï, a 29-year-old French citizen, as one of the three suicide bombers taking hostages at the Bataclan concert hall Friday, The New York Times reports. Ahmad Almohammad, 25, was reportedly the holder of a Syrian passport authorities say was found near a Paris attacker.