A car bomb exploded in Palestinian-ruled Nablus today, causing no casualties but damaging some buildings. It's not clear if the target was Israeli troops or nearby Joseph's Tomb where hundreds of Jewish worshippers were praying. The army said the bomb may have exploded prematurely. The Al Aksa Martyrs Brigade, a terrorist group linked to the ruling Fatah movement led by Palestinian leader Mahmoud Abbas, claimed responsibility. The failed attack underscores the fragility of the Mideast cease-fire. Israel accuses Syria, Iran and the Lebanese Islamic terror group Hizbollah of trying to sabotage the truce.