最新消息，反恐部队投送传单劝居民迅速离开北部地区

JERUSALEM (CNN) -- Leaflets signed by the commander of the Israeli military were dropped over northern Gaza on Saturday morning, warning residents to "leave the area immediately" to ensure their safety.

A Palestinian man in Gaza sits on rubble to read a leaflet dropped Saturday by Israeli warplanes.

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Israeli tanks and troops have massed on the Gaza border, and an Israel Defense Forces spokeswoman said ground forces are prepared to enter Gaza when they receive orders to do so.

"Due to the terrorist actions undertaken by terrorist elements from the region of your residences against the state of Israel, the Israel Defense Forces are compelled to respond immediately in the region of your residences. For your safety, you are ordered to leave the area immediately," the leaflets say.

The geographic area covered by the word "region" was not defined. Watch the conflict unfold on both sides »

Exiled Hamas leader Khaled Meshaal promised bloodshed if Israeli ground troops enter Gaza.

"As for you, the soldiers of the enemy whose leadership are getting you ready to enter Gaza in a ground attack, you need to know that doom will await you and you will be killed, injured and captured," Meshaal, speaking in Syria, told the Al Jazeera television network Friday.

"If the enemy got into Gaza, our people will fight from one street to the next, from one house to the other, and on every inch of the land." Find out who's who on each side »

Israeli attacks on Saturday killed the commander of Gaza City's rocket-launching squads, an Israel Defense Forces spokesman said.

Hamas commander Azkariah al-Jamal died when his car was attacked early Saturday, the eighth day of the bombing campaign, Palestinian sources and the IDF said.

Another airstrike killed two Hamas militants in Khan Yunis, in southern Gaza, Palestinian officials said Saturday.

IDF Maj. Avital Leibovitch said Hamas militants had launched 20 rockets from Gaza into Israel by late afternoon Saturday.

Rockets set a house on fire in Ashkelon, damaged a kibbutz dining hall and slightly wounded two people in an eight-story building in Ashdod, according to Israeli ambulance services.

"We still see that Hamas is targeting Israeli civilians. Namely, we still did not reach the goal of crippling Hamas' launching capabilities," Leibovitch said.

"We still have many more targets to go," she added.

An IDF statement said Israeli missiles fired from jets and ships hit 25 Hamas "outposts, training camps and rocket launching sites" Saturday morning. Watch explosions in Gaza »

Those targets included a college building in El-Atatra that served as "a base for firing rockets at Israeli communities and was also used as a place of hiding and assembly by Hamas operatives," the IDF said. Learn about the background of the conflict »

Palestinian sources said Israeli missiles hit Gaza's Dahaniyah airport several times.

The houses of two alleged Hamas terror operatives were also hit, the IDF said.

One, it said, was the home of Azadin Hadad, described as the head of the Hamas military group in eastern Gaza City.

The other, in Beit Lahiya in northern Gaza, was used to store rocket-launching equipment and was the home of Ismail Renam, who "has a central role in the launching of Grad-type rockets against Israel," the IDF said.

Grad-type rockets have a longer range than the rudimentary Qassam rockets Hamas more commonly uses.

The number of rocket launches into Israel appeared to be diminishing from the recent daily average of 70. Israeli officials reported 30 rockets launched from Gaza on Friday.

Israeli officials say four people have been killed at 59 wounded in Hamas rocket attacks in the past week.

Palestinian medical sources said Saturday that at least 435 people have been killed and 2,285 wounded in Gaza.