Chau recalled seeing a burned victim upon on the platform, "One man was completely on fire, his long pants became shorts ... he crawled and fell, others helped to put out the fire".
"Extra travelling time can be expected on the Tsuen Wan Line".
The MTR said on Twitter the fire broke out on a train at the Tsim Sha Tsui station.
Police are now evaluating his mental health, Kwok said, adding that the MTR operator was a target of the attack.
The injured were carried out of the station on stretchers by paramedics and volunteers and taken to nearby hospitals. Thirteen ambulances were mobilised.
Hong Kong's counter-terror units were deployed to the scene, but there were conflicting reports on how the blaze started.
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Trains from Central to and from Tsuen Wan station will operate at five minute intervals.
The man, whose last name is Cheung, was critically injured and told police he set the fire, authorities said. According to the media, the first vehicle of the train caught fire, but it was put out later.
A Twitter account for the metro system said: 'The Tsuen Wan line accident was due to a passenger igniting unsafe goods. That train journey felt particularly long.
Witness Ray Chau, 27, said: "There was nothing we could do but to inhale the smoke".
RTHK reports that one man has been arrested for arson, but is undergoing surgery due to his injuries. "There were many people and it was impossible to run", she said.
"I saw [fire] two compartments away, there was a lot of smoke because. smoke in one compartment quickly filled the entire train. We believe he was blabbering. the things he was saying was not very coherent", said Yau Tsim, District Commander Kwok Pak-chung.
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