A man is in a life-threatening condition after suffering "serious burns" in an explosion at a house in north London.
Police were called to the property in Stapleton Hall Road, near Finsbury Park, after reports of a man armed with a weapon.
It is believed bailiffs and the man's family were at the building and the suspect, who is in his late 40s, was involved in an ongoing dispute over housing.
"It would appear a short time later there has been an explosion within the address, this explosion has caused serious burn injuries to the suspect," a Metropolitan Police spokesperson said.
"He has been taken to hospital where he remains in a life threatening condition.
"Enquiries into the cause of the explosion are ongoing. This incident is not being treated as terrorism-related.
"Two female police officers and one male police officer sustained injuries as a result of this incident and have been taken to hospital for treatment. Their injuries are not believed to be serious."
Following the explosion, the basement of the terraced house was ablaze - as well as part of the ground floor and a shed in the back garden.
Ten fire engines and 72 firefighters were sent to the scene, and the London Fire Brigade said one person had left the property before the emergency services arrived.
The London Ambulance Service said several of its crews, along with an air ambulance and a hazardous area response team, attended the scene.
The property has been evacuated as a precaution, but no other properties have been affected.
Police said no arrests have been made.