Palestinian sources: Two dead in Gaza attack
 |  An Israeli armored vehicle patrols Monday near the area where an Israeli woman and her four children were killed Sunday. |
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 Four Israeli children and their pregnant mother are killed in a terrorist attack near a bloc of Jewish settlements in Gaza.
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 Israeli helicopter gunship attacks Gaza City high-rise, hours after terrorists killed 5 Israeli family members.
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GAZA CITY (CNN) -- Two Palestinians were killed and at least 25 others were wounded early Tuesday in an Israeli helicopter attack in the Khan Yunis refugee camp in Gaza, Palestinian security sources said.
They said the Apache helicopters fired two missiles at a school after Hamas members took shelter inside it following an Israeli incursion into the camp. The incident took place between midnight and 3:40 a.m., before school was in session.
The Israel Defense Forces had no comment.
The Palestinian sources said six of the wounded were in critical condition.
Most of the wounded were militants, although some civilians -- including children -- were among those injured, the sources said.
Video recorded outside a nearby hospital showed bloodied men, some in camouflage fatigues, being carried into the building; others were rushed into the emergency room on stretchers.
Hamas members outside the hospital would not say if the dead included Hamas militants, or which of its members were wounded.
The rocket attack took place soon after Israeli tanks, bulldozers and armored vehicles rolled into Khan Yunis early Tuesday.
Hamas is designated a terrorist organization by the U.S. State Department. The group's military wing, Izzedine al Qassam, has admitted responsibility for terrorist attacks against Israeli civilians and attacks against the Israeli military.
The violence came a day after terrorists killed a pregnant Israeli woman and her four children near a Gaza settlement, according to witnesses and Israeli military sources.
The family had been on its way to campaign for a no vote in a referendum among Likud party members on whether to approve Prime Minister Ariel Sharon's plan to withdraw Israeli troops and settlers from Gaza and from parts of the West Bank. (Full story)
After the attack, two gunmen were killed by Israeli soldiers on Kissufim Road in Gaza, which leads to the Gush Katif settlements, the military sources said.
The Popular Resistance -- an amalgamation of several armed Palestinian groups including Hamas, Islamic Jihad and the Fatah military wing -- took responsibility for the attack in a leaflet distributed in Gaza City.
Later, an Israeli helicopter gunship attacked a high-rise in Gaza City that houses the Voice of Al Aqsa, a radio station run by Hamas, according to Israeli security sources, who said the station was used to incite violence. Palestinian hospital sources said at least five people suffered minor injuries.
Sunday night, four members of Al Aqsa Martyrs Brigades were killed when their car was attacked by the Israeli air force in the West Bank city of Nablus, according to Palestinian medical officials and the Israel Defense Forces.
Three other people, apparently bystanders, were wounded, Palestinian medical officials said.
The IDF described the men as "senior" terrorists responsible for attacks on Israeli civilians and soldiers.
Al Aqsa Martyrs Brigades is a militant offshoot of Palestinian leader Yasser Arafat's Fatah movement. It has carried out attacks against civilians, and is designated a terrorist organization by the United States and Israel.
CNN's Talal Aburahma and Paula Hancocks in Gaza and Yoav Appel and Matthew Chance contributed to this report.
