There is no need to reopen the investigation into the April 2010 Smolensk plane crash that killed 96 members of Poland’s military and political elite, Jerzy Miller, who headed the Polish investigation commission, said on Wednesday.

His comments come two days after a new report showed no evidence that pressure had been put on the pilots to land in the heavy fog, Polish Radio External Service said.

The report said that a voice heard on the black box recording - earlier believed to be that of General Blasik - could not be unambiguously identified.

Investigations conducted by Russia and by Miller both suggested that pressure from Blasik - and perhaps indirectly from then president Lech Kaczynski - might have been a contributing factor in the crash.

“[My] report answers the question as to what the causes of the plane crash were,” Miller said. “I don’t see any circumstances at this stage to change the statement made in the report.”

Miller said there will probably never be a full explanation of the events that led to the crash.

Ninety six people perished during the April 10 flight of President Lech Kaczynski's delegation to Smolensk for the 70th anniversary of the WWII Katyn massacre.