Rival Palestinian factions engaged in a new round of fighting Sunday that killed at least three gunmen and injured dozens of other people.
The fighting in Rafah and Gaza City further weakened a truce declared two weeks ago by factions Hamas and Fatah.
Among the victims were a Hamas activist and a member of the presidential guard of Palestinian President Mahmoud Abbas of Fatah. Both of those victims were thrown off high-rise buildings.
The fighting came as Israeli Prime Minister Ehud Olmert vowed to continue airstrikes against Gaza-based militants as long as they keep firing rockets into Israel.
On Sunday, Israel's military said it hit a building used by the Palestinian militant group Islamic Jihad and an arms workshop run by the Al-Aqsa Martyrs Brigades, the military wing of Fatah.
Both groups had claimed responsibility for a failed cross-border raid Saturday.
Some information for this report was provided by AFP, AP and Reuters.