A video has gone viral on social media allegedly showing a man being buried alive by Bashar al-Assad's forces, he was accused of sending secret material to TV stations Al Jazeera and Al Arabiya.

In the footage, men in military uniforms shovel earth over the head of the unnamed man, as he pleads for his life. Members of the security forces can be heard shouting at him for accepting money in return for leaking material to the TV stations.

As his head disappears from view under the ground, the soldiers taunt him saying: 'Say that there's no god but Bashar you animal.'

A video has gon viral on social media showing a man being buried alive by Assad's forces (YouTube)

Meanwhile, a Syrian aid worker has been shot dead and three others were wounded in the town of Duma, on the outskirts of Damascus, as the Arab League has called for an emergency meeting to discuss Syria's fragile truce.

A Syrian Arab Red Crescent volunteer, Mohammed al-Khadraa, was shot and killed in a vehicle with the Red Crescent emblem. "We are saddened and extremely shocked by the death of Mohammed al-Khadraa," Dr Abdul Rahman al-Attar, president of the Syrian Arab Red Crescent Society, said in a statement. "This is the third fatal incident involving the Red Crescent in less than eight months."

There are growing signs of that the peace plan, backed by UN secretary-general Kofi Annan, is unravelling.

According to the Syrian state news agency Sana, a massive explosion that burst in a residential area and killed at least 16 people in the city of Hama was caused by anti-regime bomb-makers.

The UK-based Syrian Observatory for Human Rights quoted witnesses as saying the blast was caused by government shelling and raised the death toll to 70.

The blast was allegedly caused by a Scud missile attack, according to experts.

The opposition also accused Assad's government of fuelling the violence in the country, saying it blocked an attempt by "an armed terrorist group" to enter Syria from Turkey.

Meanwhile, French foreign minister Alain Juppe said the UN should consider stricter measures if Annan's plan fails.

Juppe invoked Chapter 7 of the UN Charter "to stop this tragedy". The move allows the security council to take action in the fields, including a military intervention.