A Southwest Airlines pilot is under investigation for allegedly assaulting a flight attendant at a San Jose bar during an argument over wearing masks, authorities said.

The pilot was cited for assault and battery over the Oct. 18 dispute at a hotel bar, USA Today reported Tuesday.

San Jose Police Sgt. Christian Camarillo told USA Today the Santa Clara County District Attorney’s Office was reviewing the incident to determine whether criminal charges should be filed.

In a statement, the airline said: “We received reports last month about the off-duty disagreement between crew members on an overnight trip. Our internal investigation, now ongoing, would regard the outcome of charges filed with local authorities. One employee currently is on leave as this internal process unfolds. We don’t have anything additional to share.”

The pilot’s name wasn’t released.

The hotel bar incident “involved a disagreement over mask wearing or masks,” Camarillo said, declining to provide more details.