Twenty-six-year-old Noel Alexander Bertrand of Portland, Oregon, appeared in court Wednesday on suspicion of sexual assault. Bail was set at $50,000.

Bertrand didn’t yet have an attorney.

The victim who missed a connecting flight at the airport said she was raped in a deserted concourse by Bertrand after she met him at an airport bistro while two janitors passed by and did nothing.

Officers arrested Bertrand of Portland, Oregon, early Tuesday after two airline employees on the tarmac saw the attack through a window and called for help, Denver television stations KMGH and KDVR reported.

The 22-year-old woman said she was flying from Oregon to Illinois on Monday to interview at a convent and decided to spend the night at the airport when she struck up a conversation with the man.

The woman said Bertrand followed her after the bistro closed at midnight. He asked to kiss her, and she refused, but he moved in anyway and then threw her to the floor. The woman said the man pulled her pants down and assaulted her for about 10 minutes. During the attack, two airport janitors passed by and said nothing, she said.

Airport spokeswoman Jenny Schiavone told the Denver Post that a security guard called police and detained Bertrand until police arrived.

A woman who said she is Bertrand’s grandmother answered the phone at his Portland home Tuesday and said he is in Denver. She said her grandson is a former US Marine but declined further comment.

Another airport spokeswoman, Laura Coale, told KMGH that the airport was investigating whether any employees failed to report the attack.