The U.S.-led coalition has carried out an air strike to block Islamic State group fighters evacuated from Lebanon from reaching eastern Syria, its spokesman told the AFP news agency on Wednesday.

Hundreds of IS fighters were evacuated Monday from the border region between Lebanon and Syria under a ceasefire deal and were headed to an IS-held town near Syria's eastern frontier with Iraq. 

A U.S. official has blasted a deal that led to the evacuation of hundreds of Islamic State group fighters and civilians from the Lebanon-Syria border to areas close to Iraq, saying the extremists should be killed on the battlefield.

The evacuation agreement, the first such publicized deal, had already angered many Iraqis who accused Syria and Lebanon's Hizbullah of dumping the militants on the Iraqi border rather than eradicating them.

Buses carrying hundreds of Islamic State militants and their families arrived in eastern Syria on Tuesday following a negotiated evacuation from the Lebanon-Syria border, where the U.S.-backed Lebanese army deployed for the first time in years.

Lebanon has called for a U.N. peacekeeping force's mandate to be renewed without changes so that it can continue working to prevent hostilities between Israel and Hizbullah.

Syria's state news agency said Tuesday that buses taking hundreds of Islamic State militants and their families from the border area between Lebanon and Syria have arrived to eastern Syria.

SANA said the buses with the militants and their families arrived on Tuesday in Deir Ezzor province, an IS-stronghold.

Islamic State militants and their families began leaving a border area between Lebanon and Syria on Monday as part of a controversial negotiated deal with the extremist group to end its presence there, Lebanese and Syrian media reported.

Israeli Prime Minister Benjamin Netanyahu greeted visiting U.N. Secretary-General Antonio Guterres on Monday with blistering criticism of the international body's treatment of Israel and accusing it of failing to prevent arms from being smuggled to Lebanon's Hizbullah.

The remains of eight Lebanese soldiers kidnapped by the Islamic State group three years ago were located Sunday, a senior Lebanese official said, in a negotiated deal that followed a military offensive to drive the militants out of the border area with Syria.

Major General Abbas Ibrahim, the chief of Lebanese General Security, said seven bodies buried in Lebanon near the border with Syria were removed while the body of slain soldier Abbas Medlej was yet to be located. He said the fate of a ninth soldier remained unknown amid reports that he had defected to the Islamic State group.

Lebanese security forces on Sunday found six bodies “likely” belonging to Lebanese troops abducted by the Islamic State group in 2014, General Security chief Maj. Gen. Abbas Ibrahim announced.

The United States has blasted the commander of the U.N. peacekeeping force in Lebanon, accusing him of turning a blind eye to Hizbullah weapons smuggling.