Russian investigators suggested pilot error may have played a role in the plane crash that killed the president of Poland, April 10.
"The readings confirm that there were no problems with the plane, and that the pilot was informed about the difficult weather conditions, but nevertheless decided to land," Deputy Prosecutor General Alexander Bastrykin said during a briefing with Russian Prime Minister Vladimir Putin in Smolensk.
Investigators say the pilot was flying too low in thick fog and narrowly missed the runway during an attempted landing in Russia.
The crash killed 96 people including dozens of Poland's top political leaders.
Meanwhile in Warsaw, Poland, tens of thousands of people gathered to watch the body of President Lech Kaczynski pass through the streets.
Many Poles are expressing their grief at the presidential palace, now carpeted with candles.
Kaczynski is survived by his mother, Jadwiga; twin brother, Jaroslaw; daughter, Marta, and two granddaughters.