US President Barack Obama has called the leaders of the Britain, France and Italy to discuss ways to respond to the crisis in Libya. Mr. Obama outlined a range of possible measures, including plans for humanitarian assistance. The Swiss government has ordered an immediate freeze on any assets belonging to Col. Gaddafi. Earlier, the White House said all options were on the table, including sanctions. It said the military would present its own proposals to Mr. Obama. Meanwhile, forces loyal to Col. Gaddafi have launched attacks on towns near the capital, Tripoli, to regain control of areas seized by the opposition. A witness in Zawiya, said an army unit had attacked protesters with machine guns and rocket-propelled grenades, killing at least ten people.