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A United Airlines flight diverted to Salt Lake City last week after the pilots discovered a crack in one of the layers of the windshield.

The National Transportation Safety Board, which is investigating the incident, told Autos News on Sunday that the windscreen of the flight that was en route Thursday from Denver to Los Angeles was being sent to its laboratory for examination. 

The multilayer windshield is designed to still function in case one of the layers is damaged, according to officials.

NTSB Investigators will seek to determine if something struck the wind shield of the Boeing 737 mid-flight, and if so, what that object was. As part of the investigation, the NTSB will speak to the pilots about what they saw and review any available flight voice and data recorder details.

There were 134 passengers on the flight and six crew members, according to United. The airline said the plane landed safely in Salt Lake City, and another aircraft transferred the passengers to Los Angeles. 

Much of the NTSB and the Federal Aviation Administration communications staff are furloughed due to the ongoing government shutdown. No other information was immediately available.