A plane crashed that killed Polish President Lech Kaczynski, his wife and 94 top government and military officials 10 years ago may not have been caused by pilot error.

During a Friday appearance on Newsmax TV’s “National Report,” chair of Poland’s Smolensk Air Disaster Investigation Antoni Macierewicz said new evidence shows that explosive materials were found on the plane.

Speaking through a translator, the former Minister of National Defense said that laboratories in Poland, Great Britain and the U.S. confirmed the presence of explosive materials on the left and center wing of the plane.

The Tu-154 air force jet went down on April 10, 2010 as it attempted to land in fog at an airport near Smolensk, Russia. The delegation was headed to commemorate a World War II massacre of about 22,000 Polish officers by the Soviet Union. 

With the new evidence, Macierewicz said there is an investigation into the air traffic controllers that “misled” the plane to the ground. He said there will also be a probe into identifying the people responsible for the crash.

“The Polish people for a long time have suspected that this was an explosion,” he said, adding they were lied to and told something else.

Now, he said the Polish people can have relief because they know the truth. 

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