Russia's Defence Ministry has said the wreckage of the military plane that crashed into the Black Sea on Christmas Day - killing all 92 people on board - shows no signs of damage from an explosion or fire, Russian media reported.
More than 3,000 people have been involved in the search for victims' bodies and aircraft debris. Two black boxes have since been recovered.
Plane debris has been dragged from the Black Sea in a huge recovery operation after Sunday's crash.
Russian officials declared the investigation is now focusing on technical faults or a pilot error.
All 84 passengers and eight crew on the Russian military's Tu-154 plane when it crashed two minutes after taking off from the southern city of Sochi en route to Syria.
More than 3,500 people on 45 ships - including 135 divers from across Russia - have been sweeping a vast crash site in the Black Sea and along the shore, according to the Defense Ministry.
The Democratic presidential candidate may also have shown his cards on his choice of running mate.
The US president also shared a post on Twitter accusing Dr Anthony Fauci of misleading the public over hydroxychloroquine.
Fears over an impending second wave of coronavirus dominates Wednesday’s front pages.