U.S. President Donald Trump's adviser Jared Kushner on Sunday questioned the ability and willingness of Palestinian President Mahmoud Abbas to make concessions for a peace agreement with Israel.

A wave of air strikes on rebel towns in southern Syria on Sunday killed at least five civilians and put a hospital temporarily out of service, a monitor said. 

The Syrian Observatory for Human Rights blamed the bombing raids on regime ally Russia.

Prince William arrived in Jordan on Sunday at the start of a Middle East tour that will see him become the first British royal to pay official visits to both Israel and the Palestinian territories.

Jordan said Sunday it would be unable to host a new wave of Syrian refugees, as troops loyal to Damascus prepare an offensive for the war-torn country's rebel-held south. 

"The large number of Syrians we're hosting in terms of financial resources and infrastructure does not allow for the reception of a new wave of asylum seekers," Jumana Ghanimat, minister of state for media affairs, told AFP. 

NATO chief Jens Stoltenberg said Sunday the alliance was prepared to help out in troubled Libya as it grapples with a migrant crisis but warned there were no military solutions.

Speaking to Italian daily La Repubblica, Stoltenberg said: "NATO is ready to help Libya construct its security institutions."

The Israeli air force on Sunday fired a missile at a drone approaching its northern border from Syria, causing it to turn back, the army said.

The United States has warned rebels in southern Syria that they should not expect military intervention if government troops launch an assault against them, a rebel commander told AFP Sunday. 

A Western-educated trainee helicopter pilot with a huge Instagram following, Jordan's 23-year-old Crown Prince Hussein bin Abdullah has emerged as the fresh-faced future of the desert kingdom's monarchy.  

Local security forces in Syria's northern city of Raqa announced a two-day curfew starting Sunday in response to intelligence on potential attacks by the Islamic State group. 

Russia bombed rebel-held parts of southern Syria late Saturday for the first time since brokering a ceasefire there nearly a year ago, a monitor group said,  as allied regime troops prepare a ground assault.