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More police will greet Boston Marathon runners, but organizers hope to keep atmosphere festive

FILE -- In this April 15, 2013 file photo, a man dressed as a hot dog runs through Wellesley, Mass., during the 117th running of the Boston Marathon. Security will be tightened for the 2014 Boston Marathon after twin explosions killed three people and injured more than 260 near the finish line of the race in 2013. New rules include a limit on the size of water bottles, restrictions on bulky costumes, and nothing covering the face.(AP Photo/Michael Dwyer, File)

FILE -- In this April 15, 2013 file photo, a man dressed as a hot dog runs through Wellesley, Mass., during the 117th running of the Boston Marathon. Security will be tightened for the 2014 Boston Marathon after twin explosions killed three people and injured more than 260 near the finish line of the race in 2013. New rules include a limit on the size of water bottles, restrictions on bulky costumes, and nothing covering the face.(AP Photo/Michael Dwyer, File)  (The Associated Press)

This year's Boston Marathon will feature more police, more surveillance cameras and tightened rules for runners and spectators.

But organizers hope the marathon's 118th running will still have the celebratory atmosphere of past years.

Police and emergency management officials have been working for months on heightened security plans for the 26.2-mile route in the wake of last year's deadly terror attack.

Authorities say two brothers built and planted pressure-cooker bombs near the marathon finish line. The twin explosions killed three people and injured more than 260.

Some of the new security measures include checkpoints for spectators and prohibiting unregistered "bandit" runners from joining the race.

The marathon is scheduled for April 21.