BURNS, Ore. — Authorities arrested a man they said was driving a government vehicle stolen from a wildlife refuge being occupied by an armed group protesting federal land policies as the standoff in Oregon’s high desert hit the two-week mark.

Kenneth Medenbach, 62, of Crescent was arrested by Oregon State Police at a grocery store in Burns for investigation of unauthorized use of a motor vehicle. It was unclear if he has a lawyer. Medenbach is already facing charges in U.S. District Court in Medford after authorities said he illegally camped on federal land between May and November last year, according to federal court records.

Authorities also say they recovered a second stolen vehicle from the Malheur National Wildlife Refuge but provided no other details. U.S. Fish and Wildlife Service previously reported the vehicles had been stolen.

The occupation started Jan. 2 as a protest over two area ranchers who had been convicted of arson being returned to prison to serve longer sentences.