Two trains collided outside the Indonesian capital Jakarta late on Monday, killing at least four people, injuring dozens and prompting a mass evacuation effort, officials said.

There were chaotic scenes at the Bekasi Timur station some 25km (15 miles) from Jakarta, with rescuers shouting for oxygen tanks as ambulances stood by in a snaking queue, lights flashing.

An Agence France-Presse reporter at the scene witnessed people being carried out of the wreckage and loaded into waiting ambulances as...