The National Safety Transportation Board has found that helicopter traffic out of Ronald Reagan International Airport posed an “intolerable risk to aviation safety by increasing the chances of a mid-air collision” ahead of a crash last month that resulted in the deaths of 67 people.

The National Transportation Safety Board uncovered more than 15,000 “near-miss events” between helicopters and jets at Reagan National airport in just three years leading up to the American Airlines jet and Army helicopter collision that killed 67 people.

There's an "intolerable risk to aviation safety" with helicopters and planes flying too close to one another near DCA.