More than 800,000 people displaced by war in Lebanon have begun returning to their hometowns following a lull in violence amid the Israel-Hezbollah war, the United Nations said.

The announcement late on Tuesday came as Lebanon and Israel began a new round of U.S.-sponsored talks in Rome aimed at ending the fighting, which are scheduled to run until Thursday.

The United States said it remains "fully committed" to support both Lebanon as Israel as they held a fresh round of U.S.-sponsored talks in Rome on Tuesday.

"The United States remains fully committed to supporting both governments as they carry this process forward in a manner that delivers lasting security for both countries, eliminates security threats to Israel, and restores Lebanese state authority throughout the south," State Department spokesman Tommy Pigott said on X.

The U.S. Embassy in Beirut on Tuesday posted an X message marking the sixth anniversary of the Beirut port explosion.

Families of victims of the Beirut port explosion gathered on Tuesday demanding answers and accountability on the sixth anniversary of the catastrophe, in a country long plagued by official impunity.

"Until now, we haven't gotten justice. There has been no accountability and nobody has been arrested," said Hiyam al-Bikai from a rally at the port to commemorate victims of the disaster, including her son Ahmad.

Jean Arnault, Officer-in-Charge of the Office of the United Nations Special Coordinator for Lebanon (UNSCOL), noted Tuesday that "time has not erased the pain of those whose lives were irrevocably changed in a matter of seconds" due to the 2020 Beirut port blast, nor has it diminished "the urgency of securing justice."

Lebanon and Israel held a fresh round of U.S.-sponsored talks in Rome on Tuesday, with Beirut seeking Israel's phased withdrawal from the country's south.

Convoys carrying delegations from the two sides arrived in the morning to the U.S. embassy in the Italian capital, where discussions are scheduled to run until Thursday.

Hezbollah leader Sheikh Naim Qassem said on Tuesday that direct negotiations between Lebanon and Israel would bring "nothing but shame, humiliation, and successive compromises" for Lebanon, ahead of new talks in Rome.

Hezbollah chief Sheikh Naim Qassem said on Tuesday that he had no objection to meeting openly with Syria's leadership, the first time he has expressed such a stance after his Iran-backed group fought for Syria's former authorities.

Lebanese authorities arrested the former Palestinian ambassador to Beirut ahead of his extradition to face corruption charges back home, a Lebanese judicial official told AFP.

The seventh round of Lebanese-Israeli talks, which will be held at the U.S. Embassy in Rome, will witness a Lebanese participation with an unprecedentedly large political and military delegation led by former ambassador Simon Karam, an informed Lebanese source said.