Poland has received eight boxes of new evidence from Russia relating to the investigation into the plane crash near Smolensk on April 10 that killed President Lech Kaczyński and 95 others.

Edmund Klich, Poland's representative to the Interstate Aviation Committee (MAK), the Russian body investigating the air crash, was given the boxes on Wednesday evening.

“We are transferring 251 items and more than 10,000 pages,” MAK deputy chairman Oleg Yermolov was quoted as saying by Russian news agency, ITAR-TASS.

The documents, he said, are originals found in the wreckage of the plane, and include instruction manuals, design documents and instruments used for navigation.

“We are also transferring the results of the analysis of the fuel and lubricating materials that were used in the plane,” Mr Yermolov said.

Before chief military prosecutor Krzysztof Parulski last week collected documents pertaining to the Smolensk investigation, some Polish politicians had expressed their dismay at Russian delays in handing over certain materials.

Prime Minister Donald Tusk even called for Mr Klich to go to Moscow and discuss the matter formally with MAK.