Israeli warplanes struck terrorist targets near the Nuseirat refugee camp in Gaza City Monday after helicopters used heavy machine guns against the sources of the 10 rockets launched from the northern Gaza district of Bet Hanoun Monday morning, the seventh day of Passover. The rockets aimed at Israeli army patrols and the town of Sderot, caused damage but no casualties. DEBKAfile: The rare daylight Israeli air strikes and use of helicopters indicated that the IDF is treating this round of rocket fire as a serious escalation of aggression from the Gaza Strip and resolved to curtail it without delay.