Fire at Association of Chief Police Officers' London office
A fire had to be tackled at the Association of Chief Police Officers' (ACPO) office in central London.
Four fire engines attended the blaze at the nine-storey building in Victoria Street, Westminster, at about 18:15 GMT.
London Fire Brigade said the fire was put out by 18:50 GMT and damaged 10% of a kitchen area.
Eyewitness Mark Guard, 47, a film-maker, from Westminster, said he was in the building when the fire broke out.
He said the chief fire officer at the scene confirmed to him the fire had taken place "in the Metropolitan Police Commissioner's personal kitchen".
"The chief officer said it was a dishwasher that had exploded," he added.
Scotland Yard and London Fire Brigade have denied these claims.
ACPO told the BBC the Metropolitan Police Commissioner does not live on the premises and it was not his kitchen.
Scotland Yard said it believed the cause of the fire was not suspicious.