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      Man arrested for bomb threat at Trident Tech

      (Stacy Jacobson/WCIV)

      By Stacy Jacobsonsjacobson@abcnews4.com

      NORTH CHARLESTON, S.C. (WCIV) -- Charleston County Sheriff Al Cannon held a press conference Friday at noon to discuss the arrest of a man wanted for the bomb threat that was called at Trident Technical College.

      William Gregory McGrath, 35, is charged with manufacturing marijuana and manufacturing, possessing and placing a destructive device. He was arrested Thursday afternoon.

      "Our investigation doesn't indicate anyone else involved," Cannon said.

      On Dec. 17, around 4:00 p.m., an employee at Trident Technical College received a bomb threat directed at the main campus. Almost no students were on campus at the time because of the winter holiday.

      "The campus is pretty much closed for the holidays with the exception of staff and a few students. By and large it was not as active as it would be otherwise," Cannon said.

      TTC's Public Safety Department searched the area and found a suspicious item near one of the parking areas and evacuated one of the buildings.

      Cannon said an employee received a threatening email that led authorities to the device.

      "The device contained ammonium nitrate. There was an igniting source as well as some fragmentation steel nails that were taped to it," Cannon said.

      When asked if the device could have detonated, Cannon said he would not release specifics.

      Officials with the CCSO said McGrath's arrest is a result of joint investigation involving the Federal Bureau of Investigations, Bureau of Alcohol Tobacco Firearms and Explosives, Homeland Security Investigations, North Charleston Police Department, and Trident Technical College.

      Officials said they don't believe there's a remaining threat to Trident Tech or any other school in the area, but the investigation is ongoing.{}

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