Relatives and friends of the al-Hajj family gather in a mosque to pray over the bodies of the eight family members during their funeral in Khan Yunis. Said Khatib / AFP / Getty Images

The fiancee of Abdul Rahman Zamil, mourns over his body at a hospital morgue on July 7, 2014. Zamil was a member of the Ezzeddin al-Qassam Brigades, a military arm of Hamas. Eyad Al Baba / APA Images / Polaris

A Palestinian doctor writes a name on the shroud wrapping the body of a man who died from wounds incurred during an air strike on Khan Yunis. Thomas Coex / AFP / Getty Images

The body of three-year-old Mohammed Mnassrah, killed along with his parents and brother in an airstrike, is carried during his funeral in Al Maghazi refugee camp. Mohammed Saber / EPA

Palestinians carry the body of a member of the Ghanam family from under the rubble of their home following an Israeli air raid on Rafah.

Palestinians search for victims under the rubble of a house which police said was destroyed in an Israeli air strike in Rafah, Gaza Strip July 11, 2014. On the fourth day of the conflict, the death toll in Gaza has climbed over 100. Ibraheem Abu Mustafa / Reuters

Israeli airstrikes on Gaza killed four more Palestinians before dawn on Friday, raising the death toll from the four-day offensive to 120, including dozens of civilians, while a Hamas rocket struck a fuel tanker at an Israeli gas station, setting a blaze that injured eight in the port city of Ashdod.

The developments came as Israeli politicians hinted they could order the first ground invasion of Gaza in five years, and as Israeli Prime Minister Benjamin Netanyahu told a news conference Friday that Israel will at least continue its offensive until rocket fire out of Gaza is halted.

"I will end it when our goals are realized. And the overriding goal is to restore the peace and quiet," Netanyahu said, brushing off a question about possible cease-fire efforts.

The Israeli military has carried out more than 1,000 strikes against Gaza targets, and some 20,000 Israeli army reservists have been mobilized despite urgent calls for de-escalation from the international community — even Israel’s staunchest ally, the United States.

Though neither Netanyahu nor Hamas leaders have budged since the offensive began, President Barack Obama told Netanyahu by telephone on Thursday that the United States was willing to help negotiate a cease-fire, the White House said.

"Nobody wants to see a ground invasion," a spokeswoman for Secretary of State John Kerry added on Friday.

Kerry has apparently sought contact with Egypt to help mediate the dispute, but Cairo lost favor with Hamas when Egypt's military council toppled the Muslim Brotherhood president and declared the Islamist group a terrorist organization.

Israel's offensive followed a buildup in violence after three Israeli students were killed in the occupied West Bank last month and a Palestinian youth was killed in a suspected revenge attack in Jerusalem. Israel says it has struck targets in Gaza from the air and the sea, including Hamas commanders' homes, which it describes as command and control centers.

Hamas rocket fire escalated after Israeli forces arrested hundreds of the group’s members and activists in the West Bank while searching for the youths, who Israel said were abducted and killed by Hamas. But the 680 rockets fired at Israel so far have caused no fatalities, due in part to interception by Israel's U.S.-funded Iron Dome aerial defense system.

But medical officials in Gaza said at least 70 civilians, including children, are among the 120 killed since the offensive began Tuesday. Hamas reported that at least 200 houses were bombed by Israel since then and that most of the fatalities have come as a result of those bombings.

A Friday airstrike on a house in Gaza City killed a man described by Palestinian officials as a doctor and pharmacist. Medics and residents said an Israeli aircraft also bombed a three-story house in the southern town of Rafah, killing three people.

The armed wing of Hamas, which has targeted Israeli civilians in the past, has warned airlines that it intends to target Tel Aviv's Ben Gurion international airport. Despite daily rocket launches at Tel Aviv since Tuesday, international airlines have continued to fly into the airport.

"We warn you against carrying out flights to Ben Gurion airport, which will be one of our targets today because it also hosts a military air base," read a statement by the group's Izz el-Deen al-Qassam Brigades.