A dual U.S.-German citizen was charged in a New York court Sunday on suspicion he tried to firebomb the United States' mission in Tel Aviv earlier this week, the U.S. Justice Department said.

A Palestinian source familiar with negotiations aimed at securing a truce between Israel and Hamas in Gaza said Monday that a new proposal involved the release of 10 hostages, a 70-day ceasefire and a partial Israeli withdrawal.

The outline of the new potential deal comes as Israel ramps up its offensive in the Palestinian territory, and follows previous rounds of talks that have failed to reach a breakthrough ever since a two-month ceasefire fell apart in mid-March.

Israel's foreign minister on Monday praised U.S. President Donald Trump's commitment to Israel and fighting anti-Semitism during a visit by the U.S. homeland security secretary.

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.