The Federal Aviation Administration says helicopters will be permanently banned from flying near Washington, D.C.’s airport on the route where an airliner and an Army helicopter collided in midair.

The US aviation regulator said Friday it has ordered stricter safety around Washington's Ronald Reagan airport after a devastating collision between a passenger jet and a military helicopter. The Federal Aviation Administration also closed part of a corridor near Ronald Reagan National Airport that the military helicopter was using when it collided with the Bombardier CRJ-700 jet.

The investigation into a January midair collision that killed 67 people near Washington, D.C., revealed an alarming number of recent close calls just outside the nation’s capital.