The Associated Press reports that it was not clear "if the bomb had been planted after the cease-fire took hold or whether it was an older device." Israel's defense minister, Ehud Barak, said Israel "cannot accept" the attack. Hamas, however, blamed the clash on Israel.
"We will respond, but there is no point in elaborating," Barak said in comments released by his office.
Israel closed its crossings into Gaza to humanitarian aid traffic after briefly opening them Tuesday morning. Gaza border official Raed Fattouh said Israeli officials informed him the closure was due to the attack....
Although there was no claim of responsibility, Mushir al-Masri, a Hamas leader, said Israel was to blame for continuing to fire into Gaza. Al-Masri said his group had not agreed to a full cease-fire but only to a "lull" in fighting.
"The Zionists are responsible for any aggression," he said.