Islamic rebels shot down a Syrian warplane and captured its pilot Tuesday in an area south of Aleppo where insurgents are battling the Syrian army and allied militias, a monitoring group said.

Syria's military confirmed that a plane on a reconnaissance mission had been shot down with a surface-to-air missile. The pilot had bailed out and efforts were underway to rescue him, it said.

The Syrian Observatory for Human Rights said fighters from al Qaeda's Nusra Front group captured the pilot and took him to one of their headquarters in the area. There was no immediate rebel comment on the use of an anti-aircraft missile.

The human rights group said a plume of smoke was seen as the plane caught fire before it fell in the Talat al-Iss highland, where al Qaeda-affiliated rebels have come under heavy bombardment by Syrian and Russian planes since they captured the area this week.

Videos on social media also showed footage of an aircraft and pictures of the wreckage of a burnt plane surrounded by rebels.

Aerial supremacy has been a major advantage for the Syrian army, which has been battling insurgents seeking to overthrow President Bashar Assad.

Foreign-backed rebels have long demanded anti-aircraft weapons to offset the impact of devastating aerial raids by Syrian forces and, since September, by Russian planes.

But their backers have been wary of delivering weapons that could fall into the hands of hard-line groups.

Last month, Syrian rebels denied a Russian Defense Ministry report that an anti-aircraft missile had been used to shoot down a Syrian warplane in Hama province.

Officials in three rebel groups contacted by Reuters reiterated statements that that plane had been shot down with anti-aircraft guns.

A fragile "cessation of hostilities" truce has held in Syria for over a month as the various parties have tried to negotiate an end to the 5-year-old civil war.

But the truce excludes the Islamic State group and Nusra Front, and air and land attacks by Syrian and allied forces continue in parts of Syria where the government says the groups are present.