At least two people were injured in an escalator accident at a subway station in Shenzhen in China, state media said Monday, days after a 13-year-old boy died in a similar accident in Beijing.

The two were taken to hospital but were not critically injured in the accident Sunday night in the southern city, the state-run Xinhua news agency reported, citing a spokesperson for the company that runs the subway line.

The escalator changed direction and was shaking, causing the people on it to fall over, Xinhua quoted witnesses as saying.

But spokesperson Xiao Ping, of the Hong Kong-based MTR Corporation -- which operates the Shenzhen line where the accident took place -- denied that account and said the incident was still under investigation, it said.

The accident comes after a 13-year-old boy was killed and over 20 others injured on Tuesday when an escalator in a Beijing underground station suddenly reversed direction during the busy rush hour.

Xinhua said the Beijing escalator suddenly reversed direction, sending more than 20 commuters falling over each other. The dead boy, who was with his father, was crushed beneath a pile of passengers.

The MTR Corporation, which also runs that subway line, is investigating.

The government demanded nationwide safety checks on escalators after last week's accident, state media said.

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