The Palestinian Authority and Hamas traded accusations over the weekend following an explosion in the Jabalya refugee camp that killed 19 people and injured more than 120. PA officials held Hamas responsible for the explosion, which took place on Friday evening during a Hamas rally to celebrate the Israeli withdrawal from the Gaza Strip. Hamas leaders in the Gaza Strip, however, claimed Israel was behind the explosion and vowed to resume attacks on Israeli targets. Palestinian Authority Chairman Mahmoud Abbas on Saturday blamed Hamas for the explosion. Addressing thousands of supporters in Ramallah, Abbas said, "I greet you today in...