A man with a sword was arrested in Hainault, east of London, after several people were attacked and injured, the Metropolitan Police said on Tuesday.
The force said it was called just before 07:00 (0600 GMT) after a vehicle drove into a house and reports that "people have been stabbed".
BREAKING: New footage shows a man wielding a sword, as five people are treated by paramedics following a stabbing attack in north east London.
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"At this time we understand the suspect went on to attack other members of the public and two police officers," a statement read.
"We are awaiting an update on the condition of those injured."
The Met, which polices 620 square miles (1 605 square kilometres) of Greater London, said a 36-year-old man was arrested at the scene.
Deputy Assistant Commissioner Ade Adelekan said: "This incident does not appear to be terror-related."