PIMA COUNTY, AZ (Tucson News Now) - Two people who were involved in an apparent explosion this past weekend were building a bomb, according to officials.
In a news release, ATF investigators at the scene of the explosion in Amado found evidence of a galvanized pipe bomb, which was being made for a booby-trap device to protect the property.
One of the people, a 37-year-old man, was treated for non-life-threatening injuries at a hospital in Green Valley. The other is a multi-convicted felon, authorities said.
In addition to the bomb-making items, ATF investigators found four firearms and several rounds of ammunition.
The ATF is being assisted by the Santa Cruz County Sheriff's Office and the Arizona Department of Public Safety in the investigation.
The explosion happened at 2977 W. Frontage Road, near the Arivaca Road exit of Interstate 19.
Santa Cruz County Sheriff Tony Estrada said a woman called 911 around 10:30 a.m. Sunday, Sept. 17. He said Tubac Fire responded to the scene.
Hospital staff treated the man for injuries to his chest and knee, according to Estrada.
He said the man is a resident of the area.
Deputies smelled gunpowder at the scene, so they called in the FBI and the ATF, according to Estrada.