No known threats to Boston Marathon but caution urged

BOSTON (AP) — Law enforcement officials say there are no known threats to this month’s Boston Marathon but have warned against complacency six years after two bombs near the finish line killed three spectators and wounded more than 200.

Federal, state, and city officials held a news conference Wednesday to discuss safety and security at the 123rd running of the race on April 15.

Four state police helicopters will keep an eye on events. Surveillance cameras are being placed at strategic spots along the course. Hundreds of uniformed police and National Guard members will patrol the route. An undisclosed number of plainclothes officers will mingle with fans.

Joseph Bonavolonta of the FBI’s Boston office says anyone who spots anything suspicious should report it.