police have released more information on a man who opened fire in a shopping mall. ing a lar was armed with a shotgun and crude explosives. it left a mother and young man dead as well as the gunman. gas prices have dropped 3 1/2 cents this in the last two weeks. the average price of regular is $3.31 a gallon. now back to msnbc under cover. on a warm night in central florida, investigators with the polk county sheriffs office are working under cover a advertising sex for sale. what are you looking for? hour? after hour? it is 10:45 p.m. when this undercover gets a call back from a would be john. he says he s in the parking lot and he wants her to come down and meet her in the parking lot.