More than 150 bodies - including five children - have already been pulled from the wreckage after the flight carrying 217 passengers crashed in Sinai, Egypt.
The terror group has claimed responsibility for the downing of the plane, which was flying from the Egyptian resort of Sharm El-Sheikh destined for the Russian city of St Petersburg.
But after initial examinations, officials say the Russian jet could have crashed because of a technical fault.
Rescue teams also found the bodies of other victims strapped in to their seats as well as burnt corpses around 5 km (3.1 miles) radius away from the crashed aircraft.
The jet, operated by Russian airline Kogalymavia was an Airbus A-321 jet was carrying 214 Russian passengers and three Ukrainians. Out of the total 217 passegers, 138 were women, 62 men and 17 were children.
So far the victims have been named as Olga Sheina, Yulia Buleyeva, Alena Moiseeva, Anastasia Bogdanova, Valeria Bogdanova, Anton Bogdanova, Yury Shien and his daughter Anastasia.