URGENT - Connecticut-Gun-Purchase

Published On: Dec 15 2012 12:00:04 PM EST   Updated On: Dec 15 2012 03:12:38 PM EST

(CNN) -- Investigators believe that Adam Lanza, the Connecticut school massacre shooter, attempted to buy a gun at Dick's Sporting Goods in Danbury on Tuesday -- but was unsuccessful, a law enforcement source said. Employees at the store -- about 12 miles from Sandy Hook Elementary -- have been interviewed and have searched the store's surveillance cameras for evidence that Adam Lanza had been there.