The United States said Wednesday it was "horrified" by reports the Syrian government dropped barrel bombs on a displaced persons camp in the northwestern province of Idlib, calling the attack "barbaric."

The attack killed at least 10 people and wounded dozens more in the camp near Habeet, the Syrian Observatory for Human Rights said.

A U.N. official visiting Syria has called for greater access to a besieged Palestinian refugee camp outside Damascus, where residents say they have been without water for some 40 days.

Speaking to AFP, the deputy commissioner general for the U.N. agency for Palestinian refugees UNRWA said increased access to the Yarmuk camp was a priority.

At least 37 people, including children, were injured in a car bomb attack on a government-controlled neighborhood in the central Syrian city of Homs on Wednesday, state television reported.

"Terrorists detonated a car bomb in the center of Al-Zahraa neighborhood, causing deaths and injuries," it said.

A number of Syrians were arrested on Wednesday during security raids in the Chouf region in Mount Lebanon and the northeastern border area of Arsal.

State security forces announced that they had arrested two days ago 12 Syrians, who confessed to taking part in the clashes with the army in August, reported LBCI television.

Islamic State group jihadists have attacked an oil and gas field in Syria, killing at least 30 pro-regime forces and security guards, a monitoring group said Wednesday.

The Syrian Observatory for Human Rights said the attack was launched on Tuesday night and fighting continued through the night.

The Lebanese army carried out large-scale raids early on Wednesday in the northern coastal city of Tripoli and the region of Koura in search of suspects, as several armed men turned themselves in.

The army expanded its raids in the evening and arrested several suspects, including one accused of belonging to the group of Imad Jomaa, whose arrest on August 2 sparked deadly clashes with jihadist gunmen in the northeastern border town of Arsal.

U.S. warplanes renewed air strikes against Islamic State jihadists near the Syrian town of Kobane, as Iraqi peshmerga soldiers prepared to reinforce their fellow Kurds in the border area, the U.S. military said on Wednesday.

U.S. fighter jets and bombers on Tuesday and Wednesday carried out eight air raids near Kobane, targeting six vehicles, a building and several IS fighting positions over the past 24 hours, said the military's Central Command, which oversees the air war in Iraq and Syria.

An international conference on the Syrian refugee crisis vowed Tuesday to extend longterm financial aid to countries struggling with what the U.N. calls the world's "most dramatic humanitarian crisis," but did not commit to an overall figure.

Around 40 countries and international bodies adopted a declaration saying donors would "mobilize for years to come" increased development support to help nations like Lebanon and Jordan shoulder the impact of millions of Syrian refugees.

Morocco has arrested three men -- a Frenchman, a French-Moroccan and an Algerian -- accused of planning to join the Islamic State jihadist group, the interior ministry said on Tuesday.

The French-Moroccan and the Frenchman were detained on Monday after allegedly "engaging in activism and propaganda" including disseminating press releases and video recordings "apologizing for terrorist acts," the MAP state news agency said, quoting a ministry statement.

Caught between a slim hope and agonizing despair, Kurdish refugee Neriman waits in Turkey for news of her husband who disappeared five months ago fighting jihadists and is feared to be held in an Islamic State (IS) dungeon.

Muhammed, 38, went missing in the early days of the Islamist offensive on the Syrian border town of Kobane, now the subject of a brutal battle between IS militants and Kurdish fighters.