The American ambassador to Libya, J. Christopher Stevens, and three officials were killed when a mob attacked the US consulate in the eastern city of Benghazi, the interior ministry said Wednesday."The ambassador was killed along with three other officials,” said Wanis al-Sharif, the deputy minister of the interior. Stevens’ death in Tuesday’s attack was confirmed in a tweet by Mustafa Abu Shagur, the deputy prime minister.Stevens, a career officer with the US foreign service, had been in the country for less than four months after taking up his post in the capital Tripoli in May.Fawzi Wanis, who heads the High Security Commission in Benghazi, confirmed that Stevens was at the consulate when it was attacked.The film at the centre of the anti-US protests was made by an Israeli-American who describes Islam as a "cancer” and depicts the Prophet Mohammed sleeping with women, the Wall Street Journal reported.Before confirmation of Stevens’ death, US Secretary of State Hillary Clinton announced that a State Department official had been killed in the attack on the consulate, saying: "We are heartbroken by this terrible loss.”