Norman police are warning residents whose homes sustained roof damage during the recent severe weather to beware of thieves. "As a result of storms, the Norman Police Department has observed an increase in the number of thefts of building supplies, specifically shingles and roofing materials," a statement reads. "Roofing materials left unattended and temporarily stored in driveways have been stolen during the nighttime hours from several Norman homes. At this time, the Norman Police Department has no investigative leads regarding the thefts. We encourage all residents to report any and all suspicious activity regarding these incidents."