Israeli-Palestinian violence erupts on three borders

A Palestinian protester runs away from tear gas fired by Israeli security forces during clashes at Qalandiya checkpoint, near the West Bank city of Ramallah May 15, 2011. [Photo/Agencies] 

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