More than 200 missiles were fired at Israel Thursday; Israel, in turn, launched about 200 missiles against Palestinian targets. NBC's Martin Fletcher reports.
Updated 12:55 a.m. ET: Israeli troops were moving toward the Gaza Strip border, heightening Palestinian fears about a possible ground invasion, NBC News' Martin Fletcher reported late Thursday.
Some 30,000 reservists were also ordered to report for duty by the Israel's defense minister as the region's military showdown lurched closer to all-out war.
"There is a great sense of anxiety and tension in the air here," NBC's Ayman Mohyeldin reported from Tel Aviv. "People are very much worried about the ongoing operation. There's no doubt from the perspective of the Palestinians this could possibly escalate even further."
There will be momentary peace, however, as Israeli Prime Minister Benjamin Netanyahu said military would stop offensive action in Gaza during a three-hour Friday visit by Hesham Kandil, Egypt's prime minister. An Israeli official said Netanyahu was acting on an Egyptian request, Reuters reported.
Kandil's visit would be an unprecedented display of solidarity with Hamas militants embroiled in a new escalation of conflict with Israel.
In another sign of the growing fear of danger in Gaza, many humanitarian aid workers have evacuated, NBC News reported.
In the latest air strikes, three people were killed when a missile hit their car in the northern Gaza Strip. The Israeli military also said it had carried out aerial attacks and had destroyed 70 unmanned missile launch sites. Eighteen Palestinians have been killed and 100 injured in Gaza since Wednesday, Reuters reported.
In Gaza, fear of a ground invasion has sent shock waves through the region. Coming days could prove dangerous. NBC's Ayman Mohyeldin has more.
Earlier, three Israeli civilians were killed and six injured on Thursday as rockets were fired from Gaza into Israel, including a long-range missile that struck a suburb eight miles south of Tel Aviv.
The long-range missile, which landed in an open area outside Rishon Lezion, causing no injuries or damage, was thought to be the first of its kind launched from Gaza. Air raid sirens were later sounded in Tel Aviv, at about 6.30 p.m. local time (11:30 a.m. ET), NBC News reported.
The Tel Aviv metropolitan area has more than 3 million people, more than 40 percent of Israel's population.
"This escalation will exact a price that the other side will have to pay," Israeli Defense Minister Ehud Barak said in a television broadcast shortly after the strike.
Israel's ambassador to the U.S., Michael Oren, did not rule out a ground operation in Gaza in an interview with NBC's Andrea Mitchell on Thursday.
"Nobody wants a ground operation, and we are going to try to avoid that," Oren said, "But, again, we're going to have to take all necessary means to defend our citizens against this flagrant aggression. "
The funeral was held Thursday for Ahmed Jabari, the senior Hamas military commander, who was one of those killed in the Israeli Defense Force airstrikes.
The IDF said on its website that the three people killed were civilians in the southern Israeli town of Kiryat Malachi.
It added that 43 of the rockets from Gaza had been intercepted by its defense systems, and that it had targeted 156 "terror sites" in Gaza since the start of what it called "Operation Pillar of Defense."
"In the past 24 hours, 245 rockets have been fired from the Gaza Strip into southern Israel," it said.
Hamas chief Khaled Meshaal on Thursday condemned the killing of Jabari.
"Men and women in Palestine, we will continue the resistance," Meshaal said at a meeting of Islamic leaders in the Sudanese capital Khartoum.
The United Nations Security Council held an emergency meeting late on Wednesday to discuss the Israeli assault. It called for a halt to the violence, but took no action.
The Palestinian Authority renewed its call Thursday for the Security Council to stop attacks. (Hamas controls Gaza, not the Palestinian Authority.)
Egypt officially requested on Thursday a full meeting of the Security Council to discuss what it described as Israeli aggression, and withdrew its ambassador from Israel.
Egypt's President Mohammed Morsi said in a televised address to the nation Thursday that Israel's attacks on the Gaza Strip were "unacceptable" and would lead to instability in the region.
Morsi said he had discussed "ways to reach calm and end the aggression" in a telephone conversation with U.S. President Barack Obama.
Hamas is affiliated to the Muslim Brotherhood which now controls Egypt, Israel's most powerful Arab neighbor and a crucial partner in the 1979 peace treaty that stands between fragile stability and regional chaos. The Muslim Brotherhood on Thursday called for all ties with Israel to be severed.
Hamas has been emboldened by the Islamist rise to power in Egypt, viewing Morsi as a "safety net" who will not permit a second Israeli thrashing of Gaza, home to 1.7 million Palestinians.
Expecting days or more of fighting, Israel warned Hamas that all its men were in its sights and dropped leaflets in Gaza telling residents to keep their distance from militants and Hamas facilities.
"The leaflets stress that Hamas is dragging the region toward violence, and that the IDF is prepared to defend the residents of the State of Israel until quiet is restored to the region," the military said in a statement.
Israel also warned its own citizens to stay off the streets.
The United States condemned Hamas, shunned by the West as an obstacle to peace, for its refusal to renounce violence and recognize Israel.
The U.S. State Department on Thursday called for a de-escalation of the violence in the Middle East and placed the onus for that violence squarely on Hamas.
"There's one clear way to mitigate the tensions,” spokesperson Mark Toner said. “That is for Hamas to stop its rocket attacks on Israel so we can de-escalate the situation and end the violence. That's the clearest path."
Israel says it has already destroyed much of Gaza's longer-range rocket stockpiles. Reuters reported that Hamas had claimed it had fired a 1.1 ton, Iranian-made Fajr 5 rocket at Tel Aviv, but there was no reported impact in the Israeli city.
Few in the Palestinian territory's largest urban area, Gaza City, came out following the call for dawn prayers on Thursday, and the only vehicles plying the streets were ambulances and media cars.
About 400 angry mourners braved the streets, however, to bury Jabari, whose body was draped in the green flag of the Islamic militant Hamas movement. Some fired guns in the air and chanted, "God is Great, the revenge is coming."
When the body was brought into a mosque for funeral prayers, some tried to touch or kiss it. Others cried. BBC producer Paul Danahar posted pictures of the scene outside the mosque on Twitter.
President Barack Obama also spoke to Israel’s Prime Minister Benjamin Netanyahu as well as Morsi on the telephone late Wednesday.
A White House spokesman said Obama reiterated to both leaders the United States' support for Israel's right to self-defense, and agreed with Morsi on the importance of working to de-escalate the situation.
Reuters, The Associated Press, NBC News' Martin Fletcher, Ayman Mohyeldin, Catherine Chomiak and Alastair Jamieson contributed to this report.
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