Published: Nov 02, 2010 8:52 PM EDT
Updated: Nov 02, 2010 5:52 PM EDT

MIAMI (AP) - A U.S. judge in Florida has denied Argentina's extradition request for a former military officer accused of taking part in a 1972 massacre.

Magistrate Judge Robert Dube ruled Tuesday there are doubts about evidence against 68-year-old Roberto Bravo. Dube also found that Bravo was cleared by an Argentine military investigation and that Bravo's extradition is blocked by a political exception.

Bravo faces 16 murder charges in the 1972 shootings of guerrillas at a military base in the city of Trelew. The killings were an early chapter in the Argentine military's "dirty war" against leftist adversaries.

U.S. prosecutors did not immediately say if they would appeal. Bravo came to the U.S. in 1973 and has been a U.S. citizen since 1987.