Security has been beefed up in Libya, Egypt and other countries in West Asia and the North Africa region following the killing of the US Ambassador to Libya, Christopher Stevans and three other US diplomats by an armed militia in a rocket attack on their car in Bengazi. The attack happened hours after angry Islamists stormed the US embassy in Cairo late Tuesday evening. The protesters were demonstrating against a US made film, 'Innocence of Muslims', which portrayed Prophet Mohammed and Islam in bad light. The US Embassies in Tunis and Algiers have sounded alert notices for American citizens living in these countries.

Meanwhile, the United States has dispatched two destroyers to Libya and deployed a Marine team to bolster security at its Tripoli embassy after the incident.

Several world leaders have condemned the incident. UN Secretary General Ban Ki-moon and the 15-nation Security Council issued strong condemnations of the attack.

The US President Barack Obama has vowed to bring to justice those who killed the US ambassador to Libya. He told reporters that the attack on the American consulate in Benghazi would not break the bonds between the US and the new Libyan government.

China also condemned the killing and expressed shock at the attack on the consulate in Libya.

India has strongly condemned the violent acts. Foreign Secretary Ranjan Mathai spoke to the US Ambassador in Delhi and conveyed condolences at the tragic loss of lives.

Afghanistan President Hamid Karzai has assured to prevent a flare-up of anti-American violence. Libyan authorities in the meantime have blamed at the supporters of ousted leader Muammar Gaddafi's regime and al-Qaeda for the deadly attack. Meanwhile, a US lawmaker with access to intelligence has said that the attack resembled an Al-Qaeda operation.