A sport utility vehicle believed to be carrying illegal immigrants rolled several times Monday in southeastern Utah's San Juan County, killing eight men and injuring seven others, authorities said.

One of the injured was in critical condition, hours after the 3:30 a.m. MST crash in a remote area near the Utah-Arizona border, said Trooper Preston Raban of the Utah Highway Patrol.

Federal immigration agents were investigating it as a possible case of human trafficking, he said.