Rescuers work at the explosion site of a commuter train in Taipei, southeast China's Taiwan, July 7, 2016. About 20 people were injured when a section of a commuter train moving nearby Songshan Railway Station exploded on Thursday night.[Photo/Xinhua]

TAIPEI - Twenty-five passengers were injured after an explosion hit a commuter train in Taipei on Thursday night, said the city's fire department early Friday.

The injured -- 13 male and 12 female -- were rushed to six hospitals for treatment. Two of them were in serious condition.

The blast happened in the sixth car of commuter train number 1258 between Hsinchu and Keelung, when it was reaching Songshan railway station at about 10 p.m.Thursday. A fire broke out after the blast. Fire fighters put it out within several minutes.

Police found a broken steel tube at the scene, which was suspected to be the explosive device. The cause of the accident is being investigated.

Security measures have tightened at train and subway stations in the island.