REPORTED BY KALAHAN DENG
According to the extremist group’s news agency, Amaq, the militants shot the plane near to the Jazal oil fields west of the city.
The Britain-based Syrian Observatory for Human Rights said a government jet crashed in the Jazal area.
The Observatory claimed on Friday that the IS assault near Palmyra has killed at least 49 pro-government forces.
ISIS attacked the Syrian army near the city of Palmyra on Thursday, killing dozens of soldiers and advancing four kilometres of the city.
The Syrian army, backed by Russian jets, recaptured Palmyra from ISIS in March after they seized it in May 2015.
Members of the Syrian Army patrol the ancient city of Palmyra
Daesh fighters have entered from the north and west of the city, according to activists
Rami Abdel Rahman of the Syrian Observatory for Human Rights, said: “IS entered Palmyra on Saturday and now occupies its north-west.”