“In a statement, the White House said that U.S. forces did not realize the hostages were present at the sites of the two attacks.
It said Dr. Waren Weinstein, an American held by al-Qaeda since 2011, and Italian national Giovani Lo Porto, a hostage since 2012, were killed in the attacks. One of the attacks also killed Ahmed Farouq, an American who was an al-Qa’ida leader, the White House said.
A separate strike killed Adam Gadahn, an American who served as a prominent spokesman for the group and went by the nickname ‘Azzam the American,’ according to the White House. “
Source: US killed two hostages in counter-terrorism attacks | TheHill