The Federal Aviation Administration is warning pilots that it has created a no-fly zone over the site of two explosions at the annual Boston marathon.
The agency said in a notice issued on Monday about an hour after the explosions that a no-fly zone with a 3.5 miles (5.6 kilometer) radius has been created over Boylston Street. The zone is limited to flights under 3,000 feet (914 meters) in altitude, which is lower than most airliners would fly except when taking off or landing.
The notice says the no-fly zone is effective immediately and will remain in effect until further notice. Pilots planning flights were urged to call their local flight service station.