DENVER — New Year’s guests at a Denver Marriott were locked out of their rooms when the clock struck midnight and their room keys stopped working.

The 628-room Denver Tech Center Marriott says a room key malfunction kept guests out of their rooms from midnight until about 3 a.m. The hotel’s general manager, Jennifer Atkins, says it wasn’t immediately known whether the malfunction was related to the year change.

KUSA-TV in Denver reports that fights broke out among the locked-out guests and that some revelers got sick in the hallways. Denver police were called to the scene but said no one was seriously hurt. Atkins said she couldn’t confirm reports of fights and vomiting in the hallways.

Atkins says there were no confirmed reports of key card problems at other Marriotts.