At least three people have been killed in an attack in the central Israeli city of Elad.
Four other people were injured, two of them critically, the Israeli rescue service Magen David Adom said on Thursday.
In recent weeks there have been repeated deadly attacks by Palestinians and Arab Israelis.
Israel celebrated its 74th Independence Day on Thursday.
In an initial statement by the police, no information was given about the circumstances of the attack or the identity of the perpetrators.
A majority of Elad's residents are ultra-Orthodox Jews.
Israel has been rocked by a series of anti-Israel attacks for weeks.
From March 22 to Thursday, 15 people were killed.
During operations by the Israeli security forces in the occupied West Bank, among other places, 27 Palestinians and three Arab Israelis were killed, including several suspected assassins.
Palestinians commemorate Israel's founding day as the "Nakba" (disaster) because more than 700,000 people were forced to flee or were displaced as a result of Israel's founding in 1948.