FRAMINGHAM, Mass. — Public safety officials are getting ready to release more details about enhanced security for this year’s Boston Marathon.

Local, state and federal agencies, the Boston Athletic Association and leaders from the eight communities that make up the marathon route are expected to reveal the new security measures during a news conference Monday at the Massachusetts Emergency Management Agency’s headquarters in Framingham.

Authorities have been meeting for months to come up with a plan to beef up security for the April 21 marathon following last year’s deadly terror attack. Three people were killed and more than 260 injured after two bombs exploded near the finish line of the race.

This year, police are expecting about 36,000 runners and up to a million spectators.