Monitor: Al-Nusra Front Killed at Least 56 Troops in Syria Base Seizure

Militants led by Al-Nusra Front in Syria killed at least 56 soldiers, some execution-style, when they overran the regime's last base in Idlib province under the cover of a sandstorm, a monitor said Thursday.

Dozens of others were either taken prisoner or went missing when the Al-Nusra Front and a coalition of mostly Islamist groups captured the Abu Duhur military airport on Wednesday, the Syrian Observatory for Human Rights said.

"There were at least 56 (soldiers) killed yesterday and at least 40 taken prisoner, and dozens more are missing," the Observatory's Rami Abdel Rahman told Agence France Presse.

"Some soldiers were executed," said the head of the Britain-based group that relies on a network of sources on the ground in Syria for its information.

Al-Nusra Front posted pictures on Twitter of about 15 men it said were Syrian soldiers now "in the hands of the mujahedeen".

Rebels also uploaded images of helicopters and planes abandoned on the tarmac, with militants posing seated on one of the aircraft making V-for-victory signs.

The fate of other missing soldiers remained unclear, said Abdel Rahman, who added that the entire northwestern province of Idlib was under the control of Al-Nusra Front and other rebel groups.

The insurgents had taken advantage of an intense sandstorm that blanketed much of the Middle East on Tuesday evening to seize the airbase, the Observatory said.

Assad's regime effectively acknowledged the loss, with state television saying troops had left the base.

It has been at war with different rebel groups for the past four and a half years, in a conflict that has killed at least 240,000 people and forced millions more to flee abroad.