A Russian official on Friday dismissed a claim of responsibility made by the Islamic State terror organization over a deadly explosion that rocked a residential building late last year in the central city of Magnitogorsk.

According to Russian investigation committee spokeswoman Svetlana Petrenko, Russian authorities have rejected the possibility that the explosion, which occurred on Dec. 31, 2018 and left 39 people dead, was an act of terror since no trace of explosives has been found.

"From the very beginning, the investigation has been working on all possible versions of the tragedy," Petrenko said. "To date, the priority version is the explosion of cooking gas."

Petrenko requested more time for the investigations to be completed.

IS claimed on Friday in its weekly online magazine al-Naba (The News) that it had killed 39 Russian "crusaders."

The terror organization claimed it destroyed most of the 10-floor building in Magnitogorsk using an explosive device.