A commuter train whose driver apparently missed a stop signal slammed into the back of another train in Tokyo Monday, killing two people and injuring 92, police and railway authorities said.

Shuichiro Yamanouchi, vice president of Japan Railways, apologized for the crash in an emergency press conference shortly after the accident.Yamanouchi said 28-year-old Teruki Hirano, who was driving the commuter train, might have missed a signal before plowing into the back of a train stopped at a station, said a Japan Railways official.