. >> reporter: now, already this weekend in fayettefayetteville north carolina, officers arrest a man walking around a mall with a rifle, ammunition and a. >> there was a big scare and a massive response at the washington navy yard after what turned out to be an erroneous report of a shooting wednesday. tell us what happened there. >> reporter: it was a huge and quick response really showing how on edge authorities are going into this holiday weekend treating each and every concern seriously. this all started to unfold thursday morning when a woman inside the navy yard thought she heard gunshots and called 911. within minutes the building was on lock down. it prompted a boost in security at the capitol. white house tours also cancelled. three hours went by as police went painstakingly floor by floor, room by room at the navy yard searching the building. it all of course ended up to be nothing but the d.c. police chief here says this shows d.c. is ready going into this holiday weekend. >> we're aware what the discussion and chatter is around the fourth of july events and all those thre