JERUSALEM, JANUARY 28

A Palestinian gunman opened fire outside an east Jerusalem synagogue Friday night, killing seven people, including a 70-year-old woman, and wounding three others before he was shot and killed by police, officials said. It was the deadliest attack on Israelis in years and raised the likelihood of more bloodshed.

The attack, which occurred as residents were observing the Jewish sabbath, came a day after an Israeli military raid killed nine Palestinians in the West Bank. Friday's shooting set off celebrations in both the occupied West Bank and Gaza Strip, where people fired guns into the air, honked horns and distributed sweets.

The burst of violence, which also included a rocket barrage from Gaza and retaliatory Israeli airstrikes, has posed an early challenge for Israel's new government, which is dominated by ultranationalists who have pushed for a hard line against Palestinian violence. It also cast a cloud over a visit by U.S. Secretary of State Antony Blinken to the region Sunday.

Addressing reporters at Israel's national police headquarters, Prime Minister Benjamin Netanyahu said he had held a security assessment and decided on "immediate actions." He said he would convene his Security Cabinet on Saturday night, after the end of the sabbath, to discuss a further response.

Netanyahu declined to elaborate but said Israel would act with "determination and composure." He called on the public not to take the law into their own hands.

White House Press Secretary Karine Jean-Pierre said the U.S. strongly condemned the attack and was "shocked and saddened by the loss of life," noting it came on International Holocaust Remembrance Day.

U.S. officials said later Friday that President Joe Biden spoke with Netanyahu to offer U.S. support to the government and people of Israel, calling the shootings "an attack against the civilized world." "The President stressed the iron-clad U.S. commitment to Israel's security," the White House said of the call.

Israeli police said the shootings occurred in Neve Yaakov, a settlement with a large ultra-Orthodox population, and that the gunman fled in a car. Police said they chased after him and after an exchange of fire, killed him.

Jerusalem police chief Doron Turjeman confirmed seven deaths, in addition to the shooter, and said three people were wounded.

Police identified the attacker as a 21-year-old east Jerusalem resident who apparently acted alone. Turjeman promised an "aggressive and significant" effort to track down anyone who helped him.

Police also released a photo of the pistol it said was used by the attacker.

Defense Minister Yoav Gallant huddled with Israel's military chief and other top security officials and instructed them to assist police and strengthen defenses near Jerusalem and for Jewish settlements in the occupied West Bank.

"Israel's defense establishment will operate decisively and forcefully against terror and will reach anyone involved in the attack," Gallant said.

Israel's MADA rescue service said that those killed included five men and two women, among them several who were 60 or older. Jerusalem's Hadassah Hospital said a 15-year-old boy was recovering from surgery.

The attack was the deadliest on Israelis since a 2008 shooting killed eight people in a Jewish seminary in Jerusalem, according to the Foreign Ministry. Given the location and timing, it threatened to trigger a tough response from Israel.

Overnight Thursday, Gaza militants fired several rockets into southern Israel, with all of them either intercepted or landing in open areas. Israel responded with airstrikes on targets in Gaza. No casualties were reported, and calm had appeared to be taking hold before Friday night's shooting.

There was no immediate claim of responsibility. In Gaza, Hazem Qassem, spokesman for the ruling Hamas militant group, said the attack was "a revenge and natural response" to the deadly military raid Thursday.

At several locations across the Gaza Strip, dozens of Palestinians gathered in spontaneous demonstrations to celebrate the Jerusalem attack, with some coming out of dessert shops with large trays of sweets to distribute.

In downtown Gaza City, celebratory gunfire could be heard, as cars honked and calls of "God is great!" wafted from mosque loudspeakers. In various West Bank towns, Palestinians launched fireworks.