IDF Sgt. Kiven Cohen, 19, from Petach Tikvah, was killed by Arab sniper fire early this morning at the Yakinton Outpost outside Gadid in Gush Katif. A lone bullet hit him in the head following a night of heavy Arab gunfire, and he died on the way to the hospital. Israel Air Force helicopters overflew the PA city of Khan Yunis to find him, but without success. Heavy exchanges of gunfire later developed at the Tufah Crossing near N'vei Dekalim, and one Arab was killed. Israel began implementing the Gaza First agreement yesterday, towards handing over full security control in the area to the PA. Hamas claimed responsibility for the killing.