Police officers tasered an armed man in Battersea today after he threatened them.
They were called to Falcon Road when members of the public reported a man armed with a knife.
The suspect was arrested on suspicion of attempted murder of a police officer and has been taken to a south London hospital with minor injuries.
One police officer also received injuries during the incident, but did not require hospital treatment. A number of knives have been recovered at the scene.
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The creature was spotted in Hampstead Heath, the London Underground and the South Bank.
The problems appear to have been caused by a power supply problem in Queen's Park in north west London, which has affected signalling.
Cloudy conditions continuing overnight, with some patchy outbreaks of rain.