BEIRUT, Oct 11 (Reuters) - Israeli strikes killed 22 people and injured more than 100 in central Beirut on Thursday, Lebanese authorities said, as a senior Hezbollah official evaded an Israeli assassination attempt in the city, according to three security sources.

In Lebanon's south, two United Nations peacekeepers were injured when an Israeli tank fired at a watchtower at the force's main headquarters in Naqoura, prompting the U.N. to say its personnel were facing increasing danger.

The conflict between Israel and Hezbollah erupted one year ago when the Iranian-backed group opened fire in support of Palestinian militant group Hamas at the start of the Gaza war.

It has intensified dramatically in recent weeks, with Israel bombing Beirut's southern suburbs, the south and the Bekaa Valley, and killing many of Hezbollah's top leaders.

Wafiq Safa, who heads Hezbollah's liaison and coordination unit responsible for working with Lebanese security agencies, was targeted by Israel on Thursday night but survived, the security sources said.

The Israeli strikes hit a densely packed residential neighbourhood of apartment buildings and small shops in the heart of Beirut.

"I was praying. We heard the first strike and I thought it was in my house. The second one was much more powerful than the first one," said Ala'a Baydoun, a resident whose house was damaged. "I went to see where the strike was and I saw that in my house, the glass and windows had shattered. We came and saw this scene. It was a horrifying scene, it was something unbelievable."

Israel did not issue evacuation warnings ahead of the strikes and had not previously attacked the area, which is removed from Beirut's southern suburbs where Hezbollah's headquarters have been repeatedly bombed by Israel.

Lebanon's Health Ministry reported 22 people killed and 117 wounded. Among the dead was a family of eight, including three children, who had evacuated from the south, according to a security source.

Israeli strikes have killed at least 2,169 people in Lebanon over the last year, the Lebanese government said in its daily update. The majority have been killed since Sept. 23, when Israel expanded its military campaign. The toll does not distinguish between civilians and combatants.

The attempt to kill Safa, whose role merges security and political affairs, marked a widening of Israel's targets among Hezbollah officials, which previously focused on the group’s military commanders and top leaders.

There was no immediate comment on the incident by Israel or by Hezbollah.
Lebanese authorities and Hezbollah have both endorsed a ceasefire as a means to end the conflict, but diplomats fear that diplomacy has taken a back seat to military operations.

Lebanon's acting U.N. Ambassador Hadi Hachem told the council that "only diplomatic solutions and the implementation of international resolutions, the commitment to international law and international humanitarian law is the means to end this war and this aggression."

Israel did say it had killed Muhammad Abdullah, the head of the Islamic Jihad's network in the Palestinian refugee camp of Nur Shams in the West Bank. The Palestinian health ministry said on Friday that two people were killed in an Israeli strike on Nur Shams.

Abdullah, who Israel said had been involved in a number of attacks against its soldiers, was killed along with another "terrorist" in a strike near Tulkarm, the military and security agency said in a statement on Friday.

The United Nations' peacekeeping force in Lebanon, UNIFIL, said two of its personnel were injured when an Israeli tank fired at a watchtower on Thursday at its main headquarters in Naqoura, hitting the tower and causing the peacekeepers to fall.

The two peacekeepers were from Indonesia's contingent and were in good condition after being treated for light injuries, Indonesia Foreign Minister Retno Marsudi said in a statement.

The safety of more than 10,400 U.N. peacekeepers in Lebanon is "increasingly in jeopardy" and operations have virtually halted since late September, U.N. peacekeeping chief Jean-Pierre Lacroix told the Security Council. That coincides with Israel's escalation of its conflict with Lebanon.

UNIFIL called attacks on peacekeepers "a grave violation of international humanitarian law."

The White House said the U.S. was deeply concerned by reports that Israeli forces fired on U.N. positions and was pressing Israel for details.

Israel's military said in a statement its troops operated in the Naqoura area, "next to a UNIFIL base."

"Accordingly, the IDF instructed the U.N. forces in the area to remain in protected spaces, following which the forces opened fire in the area," Israel's statement said, adding it maintains routine communication with UNIFIL.

The peacekeepers are determined to remain at their posts despite Israeli attacks and orders by Israel's military to leave, the force's spokesperson Andrea Tenenti said.

In New York, Israel's U.N. Ambassador Danny Danon said Israel recommends UNIFIL relocate 5 km (3 miles) north "to avoid danger as fighting intensifies".

Danon said attacking Hezbollah was necessary so 70,000 displaced Israelis could return to homes in northern Israel.
The Middle East remains on high alert for further escalation in the region, awaiting Israel's response to an Iranian missile strike on Oct. 1.

U.S. vice president and Democratic presidential candidate Kamala Harris said de-escalation was needed.

"We have got to reach a ceasefire," Harris told reporters as she departed Las Vegas, while commenting on the situations in Gaza and Lebanon. "We've got to de-escalate."

A ceasefire remains elusive in Gaza and Lebanon. Washington's occasional condemnation of Israel over civilian deaths has mostly been verbal with no substantive change in policy.