Roanoke police are warning hotel guests about a scam designed to get their credit card information.  Police say they’ve gotten several reports of guests getting calls to their hotel rooms from someone claiming to be from hotel security.  The callers tell the guests there’s a problem with their credit cards.  They threaten to evict the guests if they don’t give their name, address and credit card information.  Police say in some cases, guests gave that out, and it resulted in fraudulent charges made on their credit cards within minutes.  Police say hotel guests getting such a call should not give personal information to the caller.  They should hang up and call the front desk–or go there in person–to check it out.  Police have not said which hotels have been targeted by the scam.