And now for the latest on the investigation into a crash on Seoul's busiest subway line that happened on Friday afternoon
Investigators are now targeting a malfunction in the automatic distance control system as the possible cause of the accident.
According to Seoul Metro CEO Chang Jung-woo normally, the signals "stop" and "caution" are given to approaching trains, but at the time of the accident the signals given were "stop" and "go ahead."
The signal system had been malfunctioning for more than four days and the problem was only discovered after the accident.
The collision happened on Line 2 at Sangwangsimni Station, when one train ran into another that had stopped at the station.
More than 240 passengers were injured but fortunately no fatalities have been reported.