The perpetrator is said to have had "personal issues".
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“One minute we were all playing with our phones, the next there was smoke everywhere.
“Some people thought there was an explosion, many people were screaming.”
He recalled seeing a burned victim on the platform.
“One man was completely on fire, his long trousers became shorts ... He crawled and fell, others helped to put out the fire,” he recalled.
Chau said the platform resembled a terrorism scene as people scrambled to leave.