GRUNDY COUNTY, Tenn. (WKRN) – A 33-year-old man was injured after a pipe bomb exploded at a Grundy County home Saturday evening.

The Grundy County Sheriff’s Office reported deputies responded to a home off Highway 399 on Stagecoach Road in Palmer after a man showed up at the emergency room in Dunlap for injuries to his hand and arm.

Carl James Arnold was injured when he detonated a pipe bomb at his residence, according to the Grundy County Sheriff’s Office.

Investigators executed a search warrant at the home with the assistance of the Bureau of Alcohol, Tobacco and Firearms, Federal Bureau of Investigation, Tennessee Bureau of Investigation, Tennessee Highway Patrol, and the Sequatchie County Sheriff’s Office.

When deputies arrived at the home, they found what appeared to be a pipe bomb that had been detonated. After searching the home, deputies found what they believe were three additional pipe bombs.

The Grundy County Sheriff reported investigators located three additional PVC pipe containers approximately 36 inches long and four inches in diameter. These containers were X-rayed and reportedly found to be full of ammunition.

Deputies also found about 70 pounds of marijuana, $7,700.00 cash and four firearms, including a fully automatic Glock handgun.

Arnold was flown to an area hospital with injuries to his left hand, face and abdomen. The investigation is still ongoing.