Israel is at war with Hamas militants, the Israeli prime minister said after the militant group's massive attacks. More than 200 Israelis were killed and several hundred wounded, as well as the hostage taking of soldiers and civilians by Hamas.
Hamas militants launched a multi-front attack on Israel on Saturday, pelting it with several thousand rockets as dozens of militant fighters breached several fortified border areas as Israel had a public holiday.
The Israeli armed forces are continuing to fight militants inside Israel, while the air force strikes Hamas targets in the Gaza Strip.
Prime Minister Benjamin Netanyahu declared that Israel was "at war" and called for a massive mobilization of reservists. The Hamas attack revived memories of the 1973 war, practically 50 years to the day.
During a meeting with the Security Council a few hours later, Mr. Netanyahu announced the three priorities of the Israeli military.
"Our first goal is to clear the area of enemy forces that have infiltrated and restore security and peace in the areas that were attacked. The second objective is to make the enemy pay a heavy price, including the Gaza Strip. The third goal is to strengthen other areas so that no one makes the mistake of joining this war," Netanyahu said, among other things.
Netanyahu vowed "strong revenge" against Hamas after the Palestinian militants launched a surprise attack on his country on Saturday.
He said Hamas would be held accountable as he added that Israel "would settle accounts with anyone who harms it."
He vowed that Israel would "dig up" any places where Hamas militants may be hiding, while urging people in Gaza to stay away from places where they might be.
Meanwhile, the Israeli opposition leader says he has proposed the formation of an emergency government with Prime Minister Benjamin Netanyahu.
In a statement, Yair Lapid said he met Netanyahu on Saturday and suggested the prime minister replace his far-right coalition with a broad-based government of centrist parties.
He said Netanyahu knows he "cannot manage a war" with his current partners. "Israel needs to be led by a professional, experienced and responsible government," he said. He said such a coalition would send a message to Israel's enemies that the country is united against its enemies.
The militant group Hamas says it has captured "dozens" of Israeli soldiers and is holding them captive in the Gaza Strip.
A spokesman for the group's military wing said the soldiers, including several officers, were captured during a surprise incursion into southern Israel on Saturday. Spokesman Abu Obedia said the captives were being held in "safe places" and militant tunnels.
Hamas militants fired thousands of rockets as dozens of fighters swept into Israeli towns near the Gaza Strip in a surprise early-morning attack during a Jewish holiday.
An Israeli army spokesman said fighting was continuing in 22 areas in southern Israel about 12 hours after Hamas militants launched a surprise attack from the Gaza Strip.
Admiral Daniel Hagari also said that Israel was striking targets in Gaza from the air and that ground operations were imminent. Hagar confirmed hostage taking in the cities of Ofakim and Beeri.
Earlier, the Israeli military and Hamas confirmed that several Israelis had been captured and taken hostage.
The sounds of rockets seen in the sky could be heard continuously in Gaza and alarm sirens could be heard from Jerusalem to Tel Aviv, the capital of Israel, about 80 kilometers to the north.
The military commander of Hamas, the group that controls the Gaza Strip, announced early Saturday that Palestinian militants have launched a wide-ranging operation against Israel.
"The initial attacks targeted the enemy's positions, its airfields and military fortifications during the first 20 minutes, with more than 5,000 rockets fired," said Mohammad Deif, Hamas's military commander.
Hours after the Hamas attack began, militants who crossed the border continued attacks inside several Israeli neighborhoods. A video shot by a mobile phone shows Israeli civilians and armed individuals battling Palestinian militants who had entered a police precinct in Sderot, an Israeli town about 2 kilometers from the Gaza border.
Film footage from the "Associated Press" news agency in another area of this shows the Israeli victims in the street, covered with blankets.
Hospitals in Israel are treating hundreds of injured, including dozens in critical condition.
The Israeli military said it launched airstrikes in Gaza, where witnesses reported heavy explosions and casualties.
Israeli army spokesman Daniel Hagari said the battle is ongoing as Israeli forces strike the southern border area.
In Iran, the only country that has supported the attack by Hamas, the deputies in the parliament shouted loudly: "Death to Israel" and "Palestine will win, Israel will be destroyed."
The massive attack by Hamas caught Israel unprepared. Saturday's developments come exactly on the 50th anniversary of another war that also caught Israel by surprise.
The 1973 war brought Israel to the brink of catastrophic defeat. The battle began with a surprise attack on two fronts by a host of Syrian tanks and Egyptian brigades. Completely unprepared and with many soldiers on leave, the Israeli army appeared to be initially defeated before repulsing its enemies in a series of decisive attacks.
Over 2,600 Israelis were killed during the war, the largest loss Israel has ever suffered in a single war. On the other hand, although there are no confirmed casualty figures, 15,000 Egyptians and 3,500 Syrians are reported to have been killed during this war.