Iran live updates: Iran says Strait of Hormuz is closed over deadly attacks on Lebanon

The ceasefire is already fraying, with Israel and Hezbollah accusing the other of violations, raising real doubts about whether this is a pause in fighting or the start of a new phase. The strikes also raising questions about whether the broader deal will hold, as U.S. Special Envoy to the Middle East Steve Witkoff heads to Switzerland for initial talks with Iran.

More than a dozen people are reported killed in Israeli airstrikes on southern Lebanon, less than 24 hours after the ceasefire between Israel and Hezbollah was announced. Local officials say at least 16 people were killed in the Nabatieh district and seven in neighboring Saida, with others wounded, after Israeli strikes hit multiple areas.

Israel said it targeted Hezbollah positions in response to incoming fire, while Hezbollah accuses Israel of striking first. Both sides showing a lack of restraint and testing this agreement.

The Lebanese Civil Defense said Saturday morning that at least 16 people have been killed in a mixture of airstrikes, drone strikes and artillery shelling that has been hitting Lebanon, with at least 12 more injured.

"Civil defense elements continue to carry out their humanitarian and relief missions in response to the calls of citizens, despite difficult field conditions and challenges," Lebanese authorities said.

The Lebanese Civil Defense added that at least 47 others were evacuated from the area.

The IDF has not yet commented on the alleged strikes.

-ABC News' Rashid Haddou

In spite of Friday's ceasefire agreement, the Lebanese Civil Defense said that at least five people have been killed on Saturday morning in a mixture of airstrikes, drone strikes and artillery shelling that has been hitting Lebanon.

The Lebanese Army also confirmed that a member of the military killed.

"Israeli brutal attacks on Lebanon continue after the latest escalation reached wide areas in the south all the way to the Bekaa Valley, resulting in more martyrs and wounded, and causing extensive destruction to properties," the Lebanese Army said in a post on social media.

"It has become clear that the continuation of these Israeli brutal attacks aims to obstruct any solution that would allow the restoration of stability in Lebanon," the statement continued.

ABC News has reached out to the IDF for a comment on the latest alleged attacks.

-ABC News' Rashid Haddou

Trump administration Special Envoy Steve Witkoff is en route to Switzerland, where Jared Kushner is expected to join him, a U.S. official said.

The travel comes after talks between the U.S. and Iran, originally set to begin Friday, were initially postponed.

Timing for when peace talks between the U.S. and Iran may begin is still unclear.

-ABC News' Shannon Kingston