Twelve Palestinians have been killed and several injured in three separate Israeli raids on the occupied West Bank on Tuesday.
Israel has carried out repeated attacks in the area since the war in Gaza broke out last October, and according to local health authorities, more than 600 Palestinians have been killed. At the same time, militant Palestinians have carried out several attacks against Israelis.
On Tuesday, six people from the armed group Hezbollah also died in an Israeli attack in Lebanon, according to Lebanese security sources, AFP reports.
"Guilty of responding"
Tensions between Israel and the Iran-backed Shia militia Hezbollah in Lebanon and Iran have grown since Hamas' political leader Ismail Haniya and Hezbollah's commander Fuad Shukr were killed.
On Tuesday evening, Hamas announced that it would appoint Yahya Sinwar as the new political leader of the group. Sinwar has previously been pointed out as the group's actual leader.
Hezbollah leader Hassan Nasrallah said on Tuesday in a televised speech that the militia and Iran are "guilty of responding" to Israel after the deadly attacks on Shukr and Haniya – "regardless of the consequences".
He further said that Hezbollah will respond "on its own or in conjunction with a unified response from the entire axis", referring to Iran-backed groups in the region.
Over the weekend, Israeli Prime Minister Benjamin Netanyahu said that the country is already in a "multi-front war" against Iran and its allies in the region.
On Monday evening, Iran's newly elected president Masoud Pezeshkian said that "the Zionist regime will receive a response for its crimes".
Meeting with Russia
The statement came during a meeting with the chairman of the Russian Security Council, Sergey Shoigu, who is visiting Tehran, reports the Italian news agency Ansa.
Moscow has been a strategic partner and friend in difficult times for Tehran, said Pezeshkian.
Shoigu, who is also Russia's former Defense Minister, also met with the chief of staff of the Iranian armed forces late on Monday.
