Investigators are probing a bizarre midair incident that broke a United plane's windshield at 36,000 feet

• A United Airlines jet's windscreen was cracked while flying at 36,000 feet.
• Images appeared to show glass in the cockpit and the captain's bloodied forearm.
• Scorch marks on the plane suggest it might have been hit by space debris.

Investigators are looking into how aUnited Airlinesjet's windscreen was broken while flying at 36,000 feet, seemingly injuring the captain.

United Flight 1093 took off from Denver on Thursday morning, scheduled for a short flight to Los Angeles.

But 37 minutes later, near the Utah city of Moab, the Boeing 737 Max began unexpectedly descending, per data from Flightradar24.

After another 10 minutes, it abruptly turned north and diverted to Salt Lake City.

In an X post on Sunday, the National Transportation Safety Board said it was investigating "acracked windscreenon a Boeing 737-8 during cruise flight."

It added that the NTSB is gathering radar, weather, and flight recorder data. The windscreen is being sent to the agency's labs.

United confirmed to Business Insider that the plane's windshield had been damaged, adding that the "plane landed safely in Salt Lake City to address damage to its multilayered windshield."

Plane windscreens are designed with several layers so that they can still function safely in case any individual layer is damaged.

xJonNYC, an aviation enthusiast who runs popular accounts on X and Bluesky, was first to report details of the damage.

He shared photos that appeared to show the broken windshield, glass in the cockpit, and the captain's bloodied forearm.

The plane also appeared to have scorch marks, suggesting that it could have been damaged byspace debrisor a small meteorite.

Business Insider has not independently verified the images shared on X.

In its statement to Business Insider, United added that passengers on the original plane were put on a new plane, noting that its "maintenance team is working to return the aircraft to service."

The second Boeing 737 Max landed in Los Angeles at 1:12 p.m. PT, about five and a half hours behind schedule.

Meanwhile, the original plane flew to Chicago Rockford Airport on Sunday. A maintenance facility there has previously said it performs work on United's 737s.