DENVER — The city on Tuesday suspended the liquor and cabaret licenses of a Denver nightclub after allegations that an unlicensed security guard sexually assaulted an underage female customer at gunpoint last month. The suspect, identified as Vicente David Espino-Gonzalez, was arrested last month and is facing several felony charges, including two counts of sex assault, strangulation and kidnapping. Investigators said surveillance video captured much of the incident, showing security guard Espino-Gonzalez leading the woman into the club's basement before allegedly assaulting her for nearly an hour. According to Denver's licensing department, Espino-Gonzalez was working through a security company whose license had been expired for nearly two years, and the guard himself did not hold a valid Denver security guard license. Investigators also accuse the nightclub's owner of serving underage patrons after an undercover operation conducted by DPD a week after the alleged assault.