WASHINGTON (AP) — U.S. commanders at a base in Afghanistan where two Marines were killed in a surprise insurgent attack last year had no explicit warning but intelligence officers there had “consistent indicators” of Taliban interest in attacking, according to an investigation report released Tuesday.

The U.S. Central Command investigation’s conclusions led the top Marine, Gen. James Amos, to announce on Monday that he had forced two senior Marine generals to retire early. Amos held Maj. Gen. Charles Gurganus and Maj. Gen. Gregg Sturdevant responsible for failures to protect their forces.