A Moscow official also stated that the plane did explode midair, but it was too early to draw any conclusions. However, the pilot did not make a distress call before the the plane lost radio contact for 30 minutes after take off.
A Russian delegation arrived on Sunday to launch a probe into the tragic accident.
So far the plane's black boxes have been recovered from the wreckage and were sent to Russia for further analysis.
It was also determined the the plane's fuel was deemed satisfactory for flight and all crew members had recently passed medical exams.
Russian authorities began the process of returning the recovered bodies to St. Petersburg earlier Monday. All 224 passengers were killed in the accident, including seven crew members and 25 children.
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