Poland’s government sub-commission investigating into the Polish presidential plane crash, which occurred near the Russian city of Smolensk in 2010, has claimed to have found some signs of an explosion on the aircraft’s left wing.

"The destroyed left wing of the Tu-154M bears signs of an explosion," the sub-commission’s press service said in a statement commenting on its recent meeting held on July 25.

The statement does not elaborate whether any traces of explosives had been detected, nor does it make any assumptions as to what could have caused the possible explosion.

The crashed aircraft’s fragments have been kept in Russia. There have recently been no reports about new examinations of the fragments.