KITTERY – A coalition of first responders is throwing its support behind Republican Sen. Susan Collins in her campaign against U.S. Rep. Tom Allen in November’s election.

On Friday, Collins received endorsements from the Professional Firefighters of Maine, the Maine Fire Chiefs Association, the Maine Troopers Association, the Maine Association of Police, the Maine Ambulance Association and the International Association of Firefighters.

The endorsements coincided with Collins’ campaign bus tour that took her to the Portsmouth Naval Shipyard and police and fire stations in southern Maine on Friday.

Collins is running for her third term in the Senate. Allen, a Democrat, is stepping down as a U.S. representative to run for Senate.