Yale st. Walmart evacuated

Anyone know what's going on? Was shopping with my gf when all of a sudden they made an announcement that everyone needs to leave the store immediately. Before this there was like 15-20 cops in the store walking around looking for something/somebody since they were going in the same direction. After we all left the store there was like 10 cruisers outside and like big cop vans / trucks and guys wearing green police outfits with vests. We just skedaddled but was wondering if anyone caught something on a scanner or news site