DENVER – Frontier Airlines, based in Denver, confirmed to local media on Monday that it is investigating the conduct of a male passenger who last week allegedly touched two women in an unwelcome manner and urinated inside a plane cabin during flight.

According to the airline, the firm had “been made aware of this situation” and is working with the “appropriate authorities” to investigate the man’s behavior, although it provided no further details about the accusations made by other passengers on the flight, who claimed that he physically and verbally harassed two women and then urinated on the back of the seat in front of him.

The airline said that the incident occurred last Thursday on Flight 864 from Denver to Charleston and that local police arrested the man 30 minutes after the aircraft landed.

The flight left Denver at 3:00 pm and lasted 3½ hours.

The Denver 7 and CBS4 local television channels posted images on their Web sites showing the man, who they did not identify, apparently urinating on the back of the seat in front of him.

As stated in the complaint filed against the man, later identified in FBI documents as Michael Allen Haag, he consumed two double vodka tonics during the flight and seemed to be “intoxicated and possibly high,” according to one of the other people on the aircraft.

One female passenger told Denver media outlets that the man apparently touched a sleeping woman and then began asking another woman questions about her sex life.

The same passenger said that the flight crew merely “warned” the man over his behavior but took no other action to ensure that he did not continue with it.

Therefore, she said, she decided to start photographing the man, taking photos of the man urinating in the passenger cabin and his arrest later at the Charleston airport.

Meanwhile, Frontier spokesman Richard Oliver said that “The safety and security of our passengers is our top priority at Frontier.”