Southwest Airlines Co. and U.S. safety regulators are trying to determine what caused a nose gear to collapse on a Boeing Co. 737 as it was being pushed back from an airport gate near Washington.

The Federal Aviation Administration and the National Transportation Safety Board are joining Southwest’s technical operations team inspecting the jet, according to the agencies. 

The airline was still working to move the aircraft Friday, following the accident the night before at Baltimore/Washington International airport, said Brandy King, a spokeswoman. There was “no indication the aircraft was impacted by another object” before the collapse, she said.

Southwest notified the FAA shortly after the incident, which occurred as the plane was being pushed away from the gate by a tractor-like vehicle known as a tug. The aviation regulator will investigate, the agency said in an e-mail statement. An NTSB investigator also will gather data, a spokesman said.

No injuries were reported among the 126 passengers and five crew members on flight 149 from Baltimore to Atlanta, according to Southwest.

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