US Secretary of State John Kerry admitted on Monday that Libyan authorities have not been informed of a counter-terrorism operation carried out by US troops in Libya to capture an alleged al-Qaida leader Anas al-Liby, suspected in American embassies' bombings in East Africa in 1998.

Speaking at a joint press conference with his Russian counterpart Sergei Lavrov on the sidelines of 2013 APEC meeting in Indonesia, Kerry said "The Libyan authorities have not been reported previously in this operation."

However, Kerry stressed that "The United States is doing everything possible and everything appropriate and legal to eliminate the terrorist threat."

He added that Anas al-Liby was a "legal target" and he would face justice in a court of law."

The Pentagon's chief spokesman George Little said Saturday that al-Liby "is currently lawfully detained by the US military in a secure location outside of Libya."

Four cars surrounded his house in Tripoli while he was returning from the dawn prayer and captured him, according to Liby 's son who eyewitnessed his father's capture.

On Sunday, prime minister of the Libyan interim government, Ali Zeidan, demanded clarifications from US officials on the military operation carried out in Tripoli. Zeidan underlined that Libyan nationals should be tried in their own country.

Liby, 49, is believed to have been one of the masterminds behind the 1998 US embassy attacks, which killed more than 220 people in Kenya and Tanzania. He has been indicted in a New York court in connection with the attacks.