Two men have been found dead at a house following a suspected carbon monoxide leak.
The pair, aged 38 and 42, were discovered at a property on Bacon Lane in Edgware, north west London, at 13:30 BST.
Five people, including two young boys, have been taken to hospital as a precaution, Scotland Yard said.
A spokesman said the deaths were being treated as unexplained. A post-mortem examination is due to take place.
Police believe there was a possible carbon monoxide leak at the building, which was “multiple occupancy”.
People from a neighbouring property were evacuated as a precaution but have since returned home.
The Metropolitan Police said no arrests have been made.
The force said in a statement: “Police in Harrow continue to deal alongside the Health and Safety Executive who have been informed.”