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DENVER — Police and members of the U.S. Marshals Service converged on a home in Denver Friday night to investigate a tip about a possible person of interest in the Jessica Ridgeway investigation.

It happened about 9:30 p.m. near W. 4th Ave. and Sante Fe Drive. Sources told FOX31 Denver’s Justin Joseph the person was a registered sex offender and had warrants unrelated to the Ridgeway case, and they wanted to question him about that.

Sources also told Joseph they wanted to get a DNA sample from the person.

Joseph reports members of the Marshals Service team arrived at the house armed with rifles and went inside the home to speak with the person.

Authorities were inside for about 30 minutes before leaving.

A woman who says the person questioned is her son told Joseph he was questioned and cleared as a person of interest in the Ridgeway case. Officials won’t comment on the activity.

This is one of about 1,500 tips investigators say they have looked into since Jessica disappeared one week ago.