(Bloomberg) -- Pilot encounters with drones are on pace to at least quadruple to more than 1,000 this year, highlighting a growing threat to U.S. aviation by unmanned aircraft.

There were 650 cases reported to the Federal Aviation Administration through Aug. 9 compared with 238 in 2014, the agency reported Wednesday night. Assuming the reports continue at the current rate, there would be more than four times the safety incidents by the end of this year.

The reports of drones spotted near traditional aircraft come from pilots on private planes and helicopters, as well as crews aboard airliners, according to an FAA release. Drone operators must obtain FAA permission before flying within five miles of an airport and must stay away from piloted aircraft.

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