Israel-Gaza-Lebanon updates: Iranian president responds to Israel's retaliatory attacks

The United Nations Development Programme published a new report Tuesday suggesting that Israel's war against Hamas has set the Gaza Strip's development back by as much as 69 years.

Poverty levels in Gaza are projected to rise to 74.3% in 2024, affecting over 4 million people, the report said -- including 2.61 million "newly impoverished" people.

The territory's GDP is expected to contract by some 35.1% in 2024 compared to a no-war scenario, it added, with unemployment potentially rising to almost 50%.

"The assessment indicates that, even if humanitarian aid is provided each year, the economy may not regain its pre-crisis level for a decade or more," UNDP Administrator Achim Steiner said.

At least 12 people were killed or injured in Israel Defense Forces attacks in northern Gaza over the past 24 hours, officials from the Hamas-run Gaza Health Ministry said Tuesday.

At least 87 people were killed over the weekend in an IDF attack in the Beit Lahia neighborhood, officials said, just north of the Jabalia refugee camp which has been the focus of recent Israeli operations in the area. The IDF disputed the death toll.

Meanwhile, the IDF dropped leaflets over Beit Lahia on Tuesday urging residents to evacuate southwards.

Footage from the area showed long lines of people -- mostly women and children -- fleeing with their belongings under the watch of Israeli forces.

-ABC News' Nasser Atta and Guy Davies

The general manager of Beirut's Rafik Hariri University Hospital said on Tuesday that staff would continue treating patients there despite a nearby Israeli airstrike.

"We are committed to continuing our work and will not evacuate the hospital," Dr. Jihad Saadeh said. "Although the hospital has suffered damage from shrapnel, we are prepared to treat patients in the hospital corridors if necessary."

The Lebanese Ministry of Public Health said 13 people including a child were killed and at least 57 others injured in the Israeli airstrike late Monday, with significant damage done to the nearby hospital -- the largest public medical facility in Lebanon.

There was no warning issued before the strike on the hospital, sources told ABC News. The Israel Defense Forces denied the hospital was hit and said its strike was on a nearby Hezbollah target.

Saadeh told Tuesday's press conference that some 50 healthcare centers, 150 ambulances, 150 paramedics and 15 hospitals have been targeted in Israeli attacks.

-ABC News' Josiane Hajj Moussa and Guy Davies

An Israel Defense Forces strike near Rafik Hariri Hospital in southern Beirut on Monday killed 13 people including a child and injured at least 57 others, according to the Lebanese Ministry of Public Health.

Seventeen of those injured required hospitalization, with seven in a critical condition, the ministry said in a Tuesday statement.

The hospital, which is the largest public medical facility in Lebanon, sustained significant damage, officials said.

There was no warning issued before the strike on the hospital, sources told ABC News.

The IDF denied attacking the hospital in a statement, claiming it was targeting a Hezbollah target close to the facility. "The strike did not hit the hospital and the IDF emphasizes that the hospital was not targeted, and the hospital itself and its operation were not affected," the IDF said.

-ABC News' Josiane Hajj Moussa, Jordana Miller and Guy Davies