The Federal Aviation Administration has created a no-fly zone over the explosion site at the Boston Marathon, the Associated Press reported:
The agency said in a notice issued Monday about an hour after the explosions that a no-fly zone with a 3.5-mile radius has been created over 811 Boylston Street. The zone is limited to flights under 3,000 feet in altitude, which is lower than most airliners would fly except when taking off or landing.