(VOVworld)-Libyan Deputy Interior Minister Wanis al-Sharif said Libyan security forces have made four arrests in their investigation into the attack on the US consulate in Benghazi in which the US ambassador to Libya Christopher Stevens and three embassy staff were killed.  The Al Qeada terrorism network is suspected to be behind the attack, which began as a peaceful demonstration but rapidly escalated into a violent attack by armed groups.

After the attack in Benghazi and protests targeting the US embassy in Cairo, Egypt, the latest attack was on the US embassy in Yemen. US President Barack Obama has urged to tighter security in US embassies all over the world. 

The attackers were part of a mob blaming America for a film they said insulted the Prophet Mohammad. Thousands of Shiite Muslims yesterday protested in many cities in Iraq, burning US flags, showing their hostility toward the US and Israel. Afghanistan President Hamid Karzai has postponed a plan to Norway out of concern that violent protests may erupt in Afghanistan.