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An unauthorized person was in a cabin of the Tu-154 plane which crashed near Smolensk on 10 April, killing the Polish President Lech Kaczynski and 95 other passengers on board. Experts say the unidentified voice can be heard on the plane`s recorder, the Polish TVN-24 channel reported on Wednesday. Though only four people are allowed to stay in the presidential plane`s cabin- captain, second pilot, navigator and an engineer, there was someone else.