ALLEN (CBSNewsTexas.com) — An active police scene is unraveling at the Allen Premium Outlets Saturday afternoon after reports of an active shooter. Video posted to social media captured the sound of gunfire at the open-air mall, and there are rumors circulating there are multiple victims. The City of Allen has since tweeted that an investigation is underway and that people should avoid the area. A man inside the outlet mall told CBS News Texas that shoppers inside the Famous Footwear store are in distress and crying. ATF (Bureau of Alcohol, Tobacco, Firearms) personnel are now responding to the incident and...