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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The letter calls for an end to harassment, abuse, and impunity in a world "ripe for change".
Police say that anyone who sees Whitehouse should not approach him, but instead call them on 999 and quote incident 23 of 18 February.