Libyan soldiers have surrounded Ansar al-Sharia, the Islamist militia suspected of killing U.S. Ambassador Chris Steves and three other Americans, but say they are in desperate need of back up. Reporting from Tripoli, The Guardian's Chris Stephen reports that the Islamist militia has been blockaded in a remote region in the eastern Libya by government troops. "They have 150 to 200 men and 17 vehicles, Toyotas and four-by-fours," said army task force commander Colonel Hamid Hassi. "These people are very dangerous." The government blockade apparently consists of infantry units with pick-up trucks retrofitted with anti-aircraft guns staked out on a highway near Susah and Derna. But they don't have enough firepower to match Ansar al-Sharia's militants.