A woman has been arrested on suspicion of attempted murder after a man was stabbed.
Police were called to a house in Hoe Street, Walthamstow, at just after 2pm on Saturday following reports of a man suffering from stab wounds.
London ambulance service (LAS) and London Air Ambulance (LAA) attended the scene and treated a man in his 20s.
He was taken to Whipps Cross University Hospital.
Police have confirmed a 23-year-old woman has been arrested in connection with the stabbing and remains in custody at an east London police station.
The stab victim's condition is described as stable.
A video of the Air Ambulance landing at the scene was uploaded to YouTube on Saturday by Umma Farooq, a UKIP candidate for Walthamstow.