Denver officials are warning residents to be on the lookout for a scammer who is making calls to people and trying to obtain credit card information.

The scammer called three residents Thursday night demanding immediate payment of parking tickets and threatened to boot or tow cars if payments was not made. Similar incidents have been reported around the nation in recent weeks.

Denver Public Works want residents to know city agencies would never call a resident demanding parking tickets be paid by phone and asking for credit card information. Anyone who provided their credit card information to this caller should contact their credit card company immediately, officials said.