A Polish investigative team scours the crash site in Smolensk. Photo: PAP/Grzegorz Michalowski

A year after the Smolensk catastrophe, investigations into the cause of the crash are still ongoing in Poland, with Russia presenting its findings at the beginning of the year.

Some say that Warsaw is still left in the dark as to the investigations, and they may be right, as Moscow is still to hand over crucial evidence into the catastrophe, including the Tupolev’s flight recorders, commonly known as ‘black boxes’.

The presidential plane crash in Smolensk been the subject of no less than four separate enquiries, both in Poland and Russia. John Beauchamp reports on two of the main investigations: by the Russian-led Interstate Aviation Committee, as well as by Polish Prosecutors.

The MAK report stipulates that a number of factors caused the crash, ultimately stating that it was pilot error that brought the Tu-154 down. What will the Polish report conclude when it is finally published?