UPDATE: Three injured in 'terrorist-related' attack in south London
The incident happened at around 2pm on Streatham High Road.
The Met Police has said: "Three people are known to have been injured in the Streatham attack earlier this afternoon. One person is at hospital in a life-threatening condition. We are in the process of informing their family.
"A second victim was treated for minor injuries at the scene before being taken to hospital.
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Hide Ad"A third victim has been taken to hospital – their condition is not life-threatening."
He said: "I was crossing the road when I saw a man with a machete and silver canisters on his chest being chased by what I assume was an undercover police officer - as they were in civilian clothing.
"The man was then shot. I think I heard three gun shots but I can't quite remember."