Hamas's military wing, the Izz al-Din al-Qassam Brigades, said Monday that a group of its' fighters infiltrated southern Israel from a tunnel in the northern Gaza Strip, (Ma'an) News Agency reported.
The operation was in retaliation for the "massacre" in the al-Shujaiyeh neighborhood of Gaza City on Sunday, Hamas said, adding that the fighters destroyed an Israeli military jeep.
Israeli media reported that ten Hamas fighters from one of two groups who entered Israel were killed.
Israeli casualties were reported in the media although an Israeli military spokeswoman said she couldn't confirm the reports.