WASHINGTON (AP) — The barrage of U.S. cruise missiles last month aimed at a Syrian terrorist cell killed just one or two key militants, according to American intelligence officials who say the group of veteran al-Qaida fighters is still believed to be plotting attacks against U.S. and European targets.

The strikes on a compound near Aleppo did not deal a crippling blow to the Khorasan Group, officials said, partly because many important members had scattered amid news reports highlighting their activities. Among those who survived is a French-born jihadi who fought in Afghanistan with a military prowess that is of great concern to U.S. intelligence officials now.