Taipei: At least 21 people were injured in an explosion inside a train carriage here on Thursday night, RT.com reported. A local TV news Channel reported that just before 10 p.m. local time there was a loud bang in the sixth carriage of a crowded commuter train, which then quickly became engulfed in flames. The Straits Times and several other local media said there were three explosions. A local newspaper cited eyewitnesses as saying that they saw a man in his 40s walk inside the carriage, put down a 15-20 cm tube-like object and quickly exit the train. National Police Agency Director General Chen Kuo-en has confirmed that the explosion was likely caused by a "firecracker-like device". However, police refused to call the incident a terrorist attack.