In 2011 he published the book " Attempt in Smolensk " ( 2010 Polish Air Force Tu-154 crash ) , which became bestseller in Poland ( with the circulation of more than 100 000 ) . He published unknown facts and concluded , that two explosions were the reason of aircraft and polish president Lech Kaczyński was murdered by russian and polish secret services , because he tried to prevent the new contract for gas supplies between Poland and Russia , which was unfavorable for Poland .
2010 Polish Air Force Tu-154 crash
2010 Polish Air Force Tu-154 crash
Leszek Szymowski