The film is believed to be from eastern Deir al-Zor province and dates from some time in 2012, according to the Syrian Observatory for Human Rights, an opposition monitoring group.
The Observatory’s head, Rami Abdelrahman, said the Nusra Front has recently been releasing several videos of their past operations. He said the man seen executing the prisoners in the video – a Nusra commander – had been killed in March 2013 in battles with local tribes in the province.