As reported by Censor.NET citing Polskie Radio, the official said it in an interview with Rzeczpospolita.
According to him, the latest developments in the case concern new recordings of conversations of the crashed plane's crew. In particular, he said, evidence will be presented that Russia's authorities and air traffic controllers were intent on making the aircraft fall.
"We have real evidence, including those concealed by the Miller's commission [previous commission probing the Smolensk tragedy - ed.]. We have horrific confessions by commission members," Macierewicz said.
According to him, the materials will be made public in October this year.
On April 10, 2010, a Tu-154 plane with a Polish government delegation on board crashed near the Russian town of Smolensk. The catastrophe killed eight crew members and 88 passengers, including President Lech Kaczynski. Both Poland and Russia continue investigating the circumstances around the tragedy.