London Canary Wharf underground station closed due to dust and faulty fan

London's Canary Wharf and Canada Water underground train stations were closed on Friday when a faulty fan left dust on the platforms, the city's transport operator said.

British transport police said the incident was not a security or police matter.

"It appears a fan in the tunnel has malfunctioned, leading to excess dust in the platform," a spokesman for Transport for London said.