WASHINGTON - The United States has sent two destroyers to Libyan waters following the death of the American ambassador during a violent anti-US demonstration, with President Barack Obama warning that the killers would be brought to justice.The USS Laboon and USS McFaul, both Arleigh Burke-class destroyers, have been sent to the waters near the North African country, according to CNN. The report cited US officials as saying the ships will give President Obama “flexibility,” should his administration decide to take action against suspected militants in Libya.Other reports cited senior officials as saying the deployment is made as a precautionary measure. The deployment came a day after Libyan gunmen attacked the US consulate in Benghazi, killing US Ambassador and other three US diplomats. The attack has prompted the State Department to pull most of the embassy staff from Libya. The Pentagon has also sent Marine Corps units to Tripoli to provide additional protection for US diplomats still in country. Tuesday’s assault on the Benghazi consulate followed a violent protest at the US embassy in Cairo over an anti-Islamic film made in the United States and reportedly promoted by a group of US-based Egyptian Copts. Initial reports said 52-year-old Ambassador Stevens, a fervent supporter of the revolt that overthrew Muammar Gaddafi and three other Americans were killed by an angry mob as they tried to flee in a car.But it is now believed that Stevens died from smoke inhalation after becoming trapped in the compound when suspected militants fired on the building with rocket-propelled grenades and set it ablaze.US officials are investigating the possibility that the assault was a plot by Al-Qaeda affiliates or sympathisers, using the protests as a diversion to carry out a coordinated revenge attack on the 11th anniversary of 9/11.Meanwhile, the Council on American-Islamic Relations (CAIR) Wednesday condemned the “disgraceful” killings of American diplomats in Libya and said that extremists must not be allowed to control the political and religious discourse worldwide.CAIR, a Washington-based Muslim civil rights organisation, made that statement at a news conference on Capitol Hill at which representatives of CAIR and other Muslim organisations condemned both the killings of the US ambassador to Libya and three other diplomats in that nation and the attack on the American embassy in Egypt. Other organisations at the news conference included the Islamic Circle of North America (ICNA), Muslim American Society - Public Affairs and Civic Engagement (MAS-PACE), the Council of Muslim Organisations of the Greater Washington, DC, Area (CMO), the Libyan Emergency Task Force, and Dar Al-Hijrah Islamic Center.]In his prepared statement, CAIR National Executive Director Nihad Awad said:“We condemn the disgraceful killings of the American diplomats in Libya in the strongest terms possible. We also condemn the attack on our nation’s diplomatic facilities in Libya and Egypt. The actions of the attackers are totally inexcusable and un-Islamic.“We agree with Secretary Clinton, who said that ‘violence like this is no way to honour religion or faith.’ The extremists who carried out these attacks deserve punishment, and the extremists who produced and promoted an intentionally inflammatory film deserve condemnation.