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SAVANNAH, Ga. (AP) - Thousands of runners are hitting the streets of Savannah for the city's third Rock 'n' Roll Marathon.

Organizers say more than 18,500 runners registered for the event Saturday, which includes the main 26.2-mile road race as well as a half marathon. Savannah-Chatham County police say extra security measures are in place after the deadly April 15 bombing at the Boston Marathon.

The marathon route winds from the starting line in Savannah's downtown historic district to residential neighborhoods that rarely see much tourist traffic. Police plan more than 60 street closures between 3 a.m. and 6 p.m. Saturday.

Organizers of the Rock 'n' Roll Marathon say the event was worth $13.6 million in direct spending by visitors to Savannah last year. City officials have agreed to host the marathons through 2016.

(Copyright 2013 The Associated Press. All rights reserved. This material may not be published, broadcast, rewritten or redistributed.)

Copyright 2013 The Associated Press. All rights reserved. This material may not be published, broadcast, rewritten or redistributed.