Residents unaccounted for after fire at First Nation near London, Ont.

LONDON, Ont. -- Police say the residents of a home engulfed in flames on a southern Ontario First Nation are unaccounted for.

Ontario Provincial Police say emergency crews were called to the scene on the Oneida Nation of the Thames, southwest of London, at about 11 a.m. Wednesday.

They say there is no immediate word on the cause of the blaze.

The fire marshall's office has been called in to investigate.