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.
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Labour strongholds tended to remain so - apart from a major loss for the party in Dudley.
Labour suffered a "terrible" defeat in Rhondda but has already won 16 Welsh Assembly seats as it looks to record a fifth term in office.
UKIP have made further gains in the local elections in the Anglia region and the Conservatives have won back control in Peterborough.