(AGI) Jerusalem, July 13 - Israeli navy commandos launched aground operation on Saturday night in the north of the GazaStrip, the first since the offensive against Hamas began,Israeli national radio said. The incursion lasted about half anhour. The Al Qassam Brigades, the military wing of Hamas,confirmed that there had been an exchange of gunfire betweentheir fighters and the Israeli special forces. An Israeli armyspokesman said that four Israeli troops were slightly woundedin the operation. Operation Protective Edge started six daysago, with more than 160 Palestinians killed and thousands morewounded so far. . .