GAZA CITY (AFP) - Five Palestinians were killed by Israeli fire in Gaza on Tuesday as activists reportedly launched rockets and a rare cross-border raid after a deadly Israeli assault on an aid convoy. Three of the five were killed by an Israeli strike in the north of the Hamas-run territory, according to Muawiya Hassanein, the head of Gaza emergency services. The Israeli military claimed it had carried out an airstrike in the area about an hour after two rockets were fired from Gaza. There were no reports of any casualties or damage from the makeshift projectiles. Israeli troops had earlier shot dead two Palestinians who had allegedly snuck across the border in the southern part of the territory, according to a military spokeswoman. There was an exchange of fire in which they were killed, she claimed, adding that no Israelis were wounded. Witnesses on the Gaza side of the border said the exchange of fire was followed by Israeli shelling, and an AFP photographer saw an Israeli helicopter firing missiles. There was no immediate report of casualties from the Palestinian side as ambulances were not able to enter the area. The Palestinian group Islamic Jihad claimed responsibility for the attack, which came after a similar raid less than two weeks ago in which two teenagers were shot dead after breaching the border fence in the same area.