Taiwan's president pushed for a swift investigation Monday after an express train derailed on a coastal tourist route, killing 18 people as it sent sleeping passengers flying from their seats.
Among those who died, the youngest was nine years old. Two students aged 12 and 13 from a junior high school in Taitung -- where the train was headed -- were also killed, according to the transport ministry.
"Everyone is concerned about the cause of the incident and I've asked prosecutors to clarify the situation... and the cause soon," President Tsai Ing-wen told reporters as she visited the scene of the accident Monday.
A task force and forensic units will determine whether the derailment was "an accident or human error" prosecutor Chiang Jen-yu said as investigators combed through the wreckage for evidence.
Passengers who survived the accident recalled how the train had been shaking intensely during the journey and was going "very fast" before it derailed.
"The train stopped twice and we were told that there were problems that needed repair but the train restarted not long after," one passenger who identified herself as Mrs Chiu told reporters.
"We felt that the speed was too fast, then there was a crashing sound and we flew off (from the seats)," she said, adding that many passengers were sleeping at the time.
An official from the Taiwan Railways Administration said the train driver had reported a pressure device used for braking had malfunctioned 30 minutes before the accident, but that it should not have caused the train to go too fast.