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DENVER — Passengers deplaned a United Airlines jet at Denver International Airport on Thursday afternoon because of a mechanical issue.

The problem arose during taxi after Flight 1660 from Minneapolis-St. Paul International Airport had landed.

After leaving the plane by stairs, passengers were taken to the terminal in buses. In a statement, United said it apologizes to its customers for the inconvenience.

A Twitter user reported about 12 firetrucks and four buses were next to the plane, which they could see from inside the airport. The Twitter user also said there was no smoke or visible fire.

United did not elaborate on what was wrong with the plane or when it would be repaired.