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MALHEUR COUNTY -- Authorities have released the names of two men critically injured after they allegedly triggered several homemade bombs in an isolated stretch of Oregon rangeland Sunday.

Sixty-year-old Drex Brooks and 59-year-old Mark Brinton from Ontario are the men responsible for the blasts, according to Malheur County Sheriff Brian Wolfe.

Brooks is listed in serious condition at a Portland hospital. At last word, Brinton was in critical condition at a Boise hospital.

Authorites say the men were injured after detonating an explosive device about 10 miles west of Vale near the Bully Creek Reservoir sometime before 7:30 p.m. Sunday.

Officers with the Nampa Bomb Squad reported finding several blast sites and one undetonated explosive about three miles north of the Bully Creek Reservoir in an unpopulated desert area.

Police say Brooks and Brinton live together in Ontario, and when officers obtained a warrant and checked their home on the 1200 block of Southwest Third Avenue, they found bomb-making materials and bomb-making instructions. Police evacuated nearby homes during the subsequent investigation.

Officers with the Malheur County Sheriff's Office, Oregon State Police, Nampa Bomb Squad, and agents with the Bureau of Alcohol Tobacco and Firearms are continue to investigate.

Wolfe says the next step in the investigation is deciding how and when to interview the injured men.

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