"No words can fully express our regret over this terrible tragedy," the White House said Thursday, revealing previously classified fining about the January operation. The US president "takes full responsibility for these operations."
The White House identified the hostages killed in the operation as American contractor Warren Weinstein and Italian aid worker Giovanni Lo Porto.
President Barack Obama expressed his regrets Thursday morning and apologized on behalf of the US government.
"As president and as Commander-in-Chief, I take full responsibility for all our counterterrorism operations including the one that inadvertently took the lives of Warren and Giovanni," Obama said.