Former singer and fugitive Fadel Shaker has been spotted on Saturday wandering, along with his bodyguards, in the Palestinian refugee camp of Ain al-Hilweh, al-Akhbar daily reported Monday.

Surveillance cameras in the camp also spotted Shaker accompanying his nephew, the daily added.

Japan's government said Monday it was investigating a video posted online that appears to show a kidnapped Japanese man being roughly interrogated by Syrian militants.

The video, which surfaced over the weekend, shows a man who identified himself as Haruna Yukawa lying on the ground with blood trickling down his face as his apparent captors question him.

At least 31 Islamic State militants were killed in Syrian air force raids Sunday in the northern province of Raqa, a stronghold of the jihadist fighters, a monitoring group said.

"The regime carried out 13 raids on the city of Raqa and 11 on the town of Tabqa in Raqa province, killing at least 31 jihadists and wounding dozens of them," said the Syrian Observatory for Human Rights.

Australia will offer to resettle some 4,400 people fleeing violence in Iraq and Syria, Immigration Minister Scott Morrison said Sunday, adding the places had been freed up by success in stopping asylum-seeker boats.

Boat arrivals have all but dried up since Australia said it would refuse resettlement to any refugees arriving on unauthorized vessels, sending them instead to Papua New Guinea and Nauru in the Pacific.

Syrian government troops have reportedly urged the residents of the eastern border village of Tufail to evacuate it ahead of a planned shelling, said the Kuwaiti al-Anbaa newspaper on Sunday.

The remaining residents of the village were warned to evacuate the area otherwise they may be harmed in the shelling.

Jihadists have killed over 700 tribal members in eastern Syria, monitors said Saturday, and are battling to seize a northern rebel bastion, sparking an appeal for an Iraq-style Western intervention.

The Syrian Observatory for Human Rights said the Islamic State (IS) jihadists have carried out the killings over the past two weeks in oil-rich Deir Ezzor province which the group mostly controls.

The Arab Tawhid Party, led by former minister Wiam Wahhab, mourned on Saturday a Syrian member who died “while resisting to an armed attack” in the neighbouring country's town of Dama.

"With pride, we mourn our dear martyr Naji Abou Shaqra who hails from Dama in Syria,” the party announced in a statement.

Syrian rebels on Saturday were defending Marea, one of their main strongholds in the north, against a rapid advance by Islamic State jihadists, a monitoring group and an activist said.

The opposition Syrian National Council in exile called for the international community to attack IS positions not only in northern Iraq but also in Syria.

The U.S. Department of State issued a travel warning advisory to Lebanon over ongoing safety and security concerns, following the latest travel warning issued in January.

“U.S. citizens living and working in Lebanon should understand that they accept risks in remaining and should carefully consider those risks,” the Department of State said in a statement.

Following the latest incidents in the northeastern border town of Arsal, fears that they could be the next target for the terrorist ISIL organization compelled the Christians in Lebanon to take precautionary protective measures, the pan-Arab daily Asharq al-Awsat reported on Saturday.

The latest developments in Iraq where hundreds of thousands of Christians and Yazidis have been displaced, aggravated fears that the the Christian community in Lebanon would face the same fate.