The footage shows allegedly members of the Shabiha, or armed groups who have assisted in the government’s crackdown, are lined up and shot.

One of the victims has been identified as Ali Zeineddin al-Berri, who has been accused of leading a shabiha group which killed 15 FSA soldiers during a truce in Aleppo on Tuesday, BBC reports.

The development comes as fierce fighting has erupted for control of Syria’s largest city, with rebel fighters putting up determined resistance as Syrian troops mount air and lank attack on Aleppo.

More than 180 Syrians were killed on Wednesday: 115 unarmed civilians, 18 armed rebels, and 45 members of regime forces, according to the UK-based group Syrian Observatory for Human Rights.

Meanwhile,  the UN said its military observers in Syria had seen the military use a fighter jet to strike the rebels in Aleppo, who were now armed with tanks.

The UN observer mission also reported seeing a fighter jet attacking the city in a field visit to the city on Tuesday.

The FSA’s military chief in Aleppo, Colonel Abdel Jabbar al-Oqaidi, said the FSA has “thousands” of rebels in the city.

“The regime says it is fighting ‘terrorist groups’. We tell the regime that we will chase them because they are the terrorists,” Oqaidi told AFP.

“We will go after them in the whole of Aleppo, until the city is liberated.”

Kassem Saadeddine, FSA spokesman, said the rebels controlled half of Aleppo city and most of its province, according to Al Jazeera.

“We hope to create a safe zone in Aleppo and [the northwestern province of] Idlib,” on the border with Turkey, Saadeddine said. Idlib and Aleppo are northern Syria’s two main cities.

Earlier Wednesday Assad said that the Syrian army was engaged in a “crucial and heroic battle… on which the destiny of the nation and its people rests” in a speech marking the 67th anniversary of the army.

“The enemy is among us today, using agents to destabilize the country, the security of its citizens… and continues to exhaust our economic and scientific resources,” Assad said.

Damascus does not recognize the uprising against his rule that erupted in March 2011, describing opposition activists and rebels of the Free Syrian Army (FSA) alike as “armed terrorist groups” funded by foreign powers.

Meanwhile, the U.N. General Assembly will vote on Friday on an Arab-drafted resolution calling on Syria’s President Bashar al-Assad to stand down, as the deadly fighting continues, according to Al Arabiya.