The Federal Aviation Administration is investigating Amazon after a delivery drone collided with an internet cable in Texas last week, the agency said on Wednesday.

One of Amazon’s MK30 delivery aircraft struck the cable in Waco, Texas, around 12:45 p.m. local time on Nov. 18, the FAA told multiple news outlets. The incident unfolded when one of the drone’s propellers became entangled in the cable after making a delivery, according to a video reported by CNBC.