An Amazon delivery drone triggered an emergency safety landing after clipping an overhead internet cable in Waco, Texas, prompting an investigation by the Federal Aviation Administration (FAA).

The incident happened on Nov. 18 at around 12:45 p.m., shortly after the drone had dropped off a package for a customer.

The MK30 drone, identified as N139PA, was rising back into the air when one of its propellers hit the thin wire.

Video of the moment shows the drone becoming tangled in the line before the motor shut off and the aircraft glided downward. The drone landed on its own, with only one damaged propeller.

Amazon said the drone's safety system worked exactly as designed. When the aircraft sensed trouble, it performed what the company calls a "safe contingent landing," which is bui

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