Russian and Polish specialists will finish on Wednesday or Thursday analyzing the data contained in the black boxes of the plane that crashed in western Russia killing the Polish president and 95 others, Polish TVN24 TV-channel reporte.
Polish investigator Zbigniew Rzepa said that the flight data and voice recorders, which have been taken to Moscow, were slightly damaged but the data had not been affected.
"They will provide good material with which to reconstruct what happened with the flight," he said.
"Based on them we will prepare material that will show what happened during the last two minutes of the flight, how the pilots controlled the plane and how the communications progressed," Rzepa said, adding that it was a time-consuming process.
"I think a final report may be issued on Wednesday or Thursday," Rzepa said.
He also said that a third black box had been found at the scene of the crash, but it had not yet been delivered to Moscow.
Moscow First Deputy Mayor Peter Biryukov said the bodies of 45 people had been identified and the city authorities expected a special plane from Poland to take the coffins home on Tuesday.
"It all depends on the cargo plane sent from Poland," Biryukov said.
Some of the relatives of the dead have already left Moscow, and the bodies of Polish President Lech Kaczynski and his wife, Maria, have been flown back to Warsaw.
The president and first lady died along with 94 other people in the plane crash near Smolensk in western Russia on Saturday morning.
The delegation of top public figures was on its way to pay tribute to some 20,000 Polish officers executed by Soviet secret police in 1940.
Poland has declared a seven-day period of national mourning.
MOSCOW, April 13 (RIA Novosti)