Month saw escalating violence between supporters, opponents of Syrian regime: 12 May detention of Sunni cleric Shadi al-Mawlawi sparked clashes between Alawites, Sunnis in Tripoli, 9 killed. Killing of Sunni cleric Ahmed Abdul Wahid at army checkpoint in N Lebanon triggered 21 May protest in Beirut, 2 killed; 11 Lebanese Shiite pilgrims kidnapped in Syria 22 May provoked further unrest. String of violent incidents on Syrian border led to several deaths, injuries. Security sources claimed al-Qaeda gunman with links to 2005 Hariri murder arrested, accomplice killed 24 May in Beirut following standoff with soldiers.