Our top story tonight
An investigation into the Seoul subway train crash has found that a mechanical malfunction caused by a signal failure led to the collision that left more than 230 people injured.
Friday's accident occurred at Sangwangsimni Station on subway line number two when a train plowed into the back of another that had stalled due to mechanical trouble.
The head of Seoul Metro says the signal light for the second train suddenly changed from "go" to "stop," and the driver was not able to stop in time.
The system that ensures trains keep a safe distance from each other was also malfunctioning at the time of the crash.
Despite increased safety inspections of Seoul's transportation systems after the Sewol-ho ferry disaster, officials admit they weren't able to catch this glitch.
“In regards to that glitch, we are at fault for not checking every single one of those devices on the tracks."
Earlier in the day, prosecutors raided the headquarters of Seoul Metro in southern Seoul to check radio communications and related safety records.
Operations for Line two have fully resumed now.
A small section of the line was closed for nine hours following the accident.
Data shows more than 7-hundred-50 million passengers rode Line two in 2012.