GAZA CITY, Gaza Strip – An explosion was heard Monday morning at the Erez (search) border crossing with Israel several hours after an Israeli airstrike killed Hamas leader Sheik Ahmed Yassin (search).
Hamas sources said they fired four homemade rockets at the crossing. Hamas has vowed to take revenge for Yassin's killing.
A puff of smoke was seen rising from the Palestinian side of the crossing. The Israeli army had no immediate comment