A woman has died in a suspected gas explosion in north-west London.
A first-floor flat was destroyed in the blast in Fulbeck Way, Harrow, just before 01:00 BST.
Another woman, a man and a baby were rescued from the property, with the woman and child taken to hospital.
About 70 firefighters tackled the flames and 40 neighbours were evacuated from their homes, says a BBC report.
Metropolitan Police detectives say they have begun an investigation into the circumstances.
"The cause of the explosion is not known at this time but a gas explosion is suspected and is being investigated by the brigade and the Metropolitan Police Service," the fire brigade said.
"The first floor partially collapsed due to the force of the explosion."
Ten fire engines were sent to the scene and a 20m cordon was put in place.
The blaze was brought under control after two-and-a-half hours.