British defence scientists will test for traces of explosives on the wreckage of a Polish presidential plane which crashed in Russia, killing all on board, amid accusations from Poland that the incident was an "act of Russian aggression”.

An investigative committee set up by the Polish government has asked experts at the MoD's Forensic Explosive's Laboratory to join a new investigation into the 2010 death of president Lech Kaczynski and 95 others.

The committee signed a commercial contract with the British laboratory at Fort Halstead, near Sevenoaks, in December, and the Polish government will pay for the work.