Syrian authorities said they arrested members of an Islamic State group cell near Damascus on Monday, accusing them of preparing attacks against the country.

The Israeli military issued an evacuation warning for parts of the southern Gaza city of Khan Yunis on Monday, following what it said were rocket launches from the area.

"Terrorist organizations continue to launch rocket fire from your areas. The Khan Yunis area is considered a dangerous combat zone and has been warned multiple times," the Arabic warning said. "Evacuate immediately to the west, to the Mawasi area."

Rescuers said devastating Israeli strikes in the Gaza Strip killed at least 52 people on Monday, 33 of them in a school turned shelter.

Syria's new authorities have agreed to help the United States locate and return Americans who went missing in the war-torn country, a U.S. envoy said on Sunday.

Rescuers in Gaza said eight people were killed and several more wounded in Israeli air strikes across the Palestinian territory on Sunday.

The Israeli army said it intercepted a missile launched from Yemen on Sunday, shortly after air raid sirens sounded in Jerusalem, according to AFP journalists.

"Following the sirens that sounded a short while ago in several areas in Israel, a missile that was launched from Yemen was intercepted," the army said in a statement.

Syria on Saturday hailed the formal lifting of sanctions by the United States as a "positive step" that will help its post-war recovery.

At least 60 people were killed by Israeli strikes across Gaza in a 24-hour period, Gaza's health ministry said Friday, as Israel pressed ahead with its military offensive and let in minimal aid to the strip.

The dead included 10 people in the southern city of Khan Younis, four in the central town of Deir al-Balah and nine in the Jabaliya refugee camp in the north, according to the Nasser, Al-Aqsa and Al-Ahli hospitals where the bodies were brought.

Since President Donald Trump announced his intent to end a half-century of U.S. sanctions on Syria, a debate has developed in his administration over how quickly and thoroughly that should happen.

At risk could be the future of a transitional government run by those who drove Syrian leader Bashar Assad from power late last year and hopes that it can stabilize the country after a devastating 13-year civil war that has left millions dead or displaced, the economy in ruins and thousands of foreign fighters still on Syrian soil.

Two Palestinian sources told AFP Friday the leaders of pro-Iran Palestinian factions who were close to former Tehran-backed ruler Bashar al-Assad have left Syria under pressure from the new authorities.

One pro-Iran Palestinian factional leader who left after Assad's December ouster said on condition of anonymity that "most of the Palestinian factional leadership that received support from Tehran has left Damascus", while another still based there confirmed the development.