Israeli-Palestinian violence erupts on three borders

A Palestinian throws a stone at Israeli security forces during clashes at Qalandiya checkpoint, near the West Bank city of Ramallah May 15, 2011. [Photo/Agencies] 

A Palestinian stone thrower runs through smoke during clashes with Israeli security forces at Qalandiya checkpoint, near the West Bank city of Ramallah May 15, 2011. [Photo/Agencies]