Shawboro, N.C.-Both the U.S. Federal Bureau of Investigation (FBI) and Currituck County sheriff’s detectives are continuing their investigations of two brothers living in a Shawboro rental house where authorities have found bomb-making materials, including nitric acid, hydrochloric acid, and sulfuric acid. Currituck County Sheriff Susan Johnson reported that her narcotics unit served a search warrant on March 11, after which narcotics detectives discovered an indoor marijuana manufacturing operation. Detectives also discovered bomb-making materials in the residence after the owner became suspicious when he called on the occupants about keeping a pet dog that was not allowed in the home. Sheriff Johnson said her office then called in the State Bureau of Investigation and the FBI. Timothy Brian Robinson, 32, was taken into custody. His brother, Daniel Allen Robinson, 34, was arrested in Chesapeake, Va., and faces two counts of possession of weapons of mass destruction, including a bottle with a fuse attached and several chemicals and poisonous plants that could be used for bomb-making. Sheriff Johnson said at a news conference that the FBI has not yet filed federal charges against the brothers. She also emphasized that the arrests emphasize the “importance of knowing your neighbors.” Daniel Robinson is being held in a Chesapeake jail without bond. Timothy Robinson is in the Currituck County Detention Center under a $60,000 bond.