(Bloomberg) -- Reports of errant drones flouting U.S. regulations including flying too close to passenger airliners and other aircraft surged late last year to an average of four incidents per day, according to Federal Aviation Administration data.

The 1,200 incident reports in 2015 were more than five times the 236 the FAA recorded a year earlier when it first began compiling the data. By the second half of last year, there were an average of four reports per day, according to figures released Friday by the agency.

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