The newspaper, citing a source close to the investigation of the crash, said the epicenter of the explosion appeared to have been at the rear of the cabin near the tail section.
"According to a preliminary version, the bomb could have been laid under the passenger seat by the window. Its operation has led to the destruction of the frame and depressurization of the cabin, which had an explosive character," the newspaper said.
All 224 people on board were killed. President Vladimir Putin vowed on Tuesday to hunt down those responsible and intensified air strikes against militants in Syria.
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An Egyptian military helicopter flies over debris from a Russian airliner which crashed at the Hassana area in Arish city, north Egypt, in this November 1, 2015 file photo.
REUTERS/MOHAMED ABD EL GHANY/FILES