Metal detectors for spectators will be installed along the entire marathon course at the world athletics championships in August as part of increased security following last week's Boston bombing.

Russian athletics chief Valentin Balakhnichyov said, “The security will certainly be reviewed after what happened in Boston. Airports, hotels, the transit system, places where you have lots of people, are always vulnerable.”

Balakhnichyov said that Moscos would have a “triple level of protection” during the Aug. 10-18 championships.

“The first level would be the Federal Security Service (FSB) and the police, then we have the city's own security personnel, and, finally, the security in and around the stadium,” he said.

“The only way to guarantee sufficient security for those coming to watch the races is to install metal detectors along the entire 42.195-km (26.2-mile) course,” Balakhnichyov added. “At the same time we don't want to make Moscow a ghost town. We must make sure that spectators, including foreign guests, are not scared away by overzealous policing.