A manhunt has been launched for the knifeman who left commuters ducking for cover and screaming as he rampaged through a south west London tube station during rush hour.

The man was spotted at Balham station wielding a blade before jumping the station barriers and escaping just after 7pm on Monday.

The British Transport Police (BTP) has started an investigation and appealed for information from witnesses who were on the busy Northern line underground train or in the station.

Footage on social media shows passengers hiding from the knifeman, diving for cover and laying low in the tube carriages.

One passenger screams ‘oh my god’ and asks ‘has he gone yet?’ as they cautiously peek down the platform as the suspect flees.

A witness posted on social media that passengers were ‘screaming’ a

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