Amazon is facing a federal probe after one of its delivery drones downed an internet cable in central Texas last week.

The probe comes as Amazon vies to expand drone deliveries to more pockets of the U.S., more than a decade after it first conceived the aerial distribution program, and faces stiffer competition from Walmart, which has also begun drone deliveries.

The incident occurred on Nov. 18 around 12:45 p.m. Central in Waco, Texas. After dropping off a package, one of Amazon's MK30 drones was ascending out of a customer's yard when one of its six propellers got tangled in a nearby internet cable, according to a video of the incident viewed and verified by CNBC.

The video shows the Amazon drone shearing the wire line. The drone's motor then appeared to shut off and the aircraft landed itself, with its propellers windmilling slightly on the way down, the video shows. The drone appeared to remain in tact beyond some damage to one of its propellers.

The Federal Aviation Administration is investigating the incident, a spokesperson confirmed. The National Transportation Safety Board said the agency is aware of the incident but has not opened a probe into the matter.

Amazon confirmed the incident to CNBC, saying that after clipping the internet cable, the drone performed a "safe contingent landing," referring to the process that allows its drones to land safely in unexpected conditions.

"There were no injuries or widespread internet service outages. We've paid for the cable line's repair for the customer and have apologized for the inconvenience this caused them," an Amazon spokesperson told CNBC, noting that the drone had completed its package delivery.

The incident comes after federal investigators last month opened a separate probe into a crash involving two of Amazon's Prime Air drones in Arizona. The two aircrafts collided with a construction crane in Tolleson, a city west of Phoenix, prompting Amazon to temporarily halt drone deliveries in the area.

For over a decade, Amazon has been working to realize founder Jeff Bezos' vision of drones whizzing toothpaste, books and other goods to customers' doorsteps in 30 minutes or less. The company began drone deliveries in 2022 in College Station, Texas, and Lockeford, California.

But progress has been slowed by a mix of regulatory hurdles, missed deadlines and layoffs in 2023 that coincided with broader cost-cutting efforts by Amazon CEO Andy Jassy.

The company has previously said its goal is to deliver 500 million packages by drone per year by the end of the decade.

The hexacopter-shaped MK30, the latest generation of Amazon's Prime Air drone, is meant to be quieter, smaller and lighter than previous versions.

Amazon says the drones are equipped with a sense-and-avoid system that enables them to "detect and stay away from obstacles in the air and on the ground." The company recommends that customers maintain "about 10 feet of open space" on their property so drones can complete deliveries

The company began drone deliveries in Waco earlier this month for customers within a certain radius of its same-day delivery site who order eligible items weighing 5 pounds or less. The drone deliveries are supposed to drop packages off in under an hour.

Amazon has brought other locations online in recent months, including Kansas City, Missouri, Pontiac, Michigan, San Antonio, Texas, and Ruskin, Florida. Amazon has also announced plans to expand drone deliveries to Richardson, Texas.

Walmart began offering drone deliveries in 2021, and currently partners with Alphabet's Wing and venture-backed startup Zipline to make drone deliveries in a number of states, including in Texas.

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