The police chief of the city of Greenfield, Brad Wentlandt said a very experienced police officer "engaged an active shooter" outside the temple and "multiple rounds were exchanged".
He said the police officer was shot several times and is now being treated in hospital for multiple gunshot wounds.
More top news
Marjorie and Michael Cawdery, both 83, are understood to have been stabbed to death in a killing their family called "incomprehensible".
Detectives have launched a murder investigation following the shooting in Brent, north west London on Friday night.
Hot and humid throughout the Bank Holiday Weekend.