President-elect Bronisław Komorowski and Prime Minister Donald Tusk are the object of a lawsuit alleging that they acted against the interest of the country in failing to pursue a joint Polish-Russian investigation after the April 10 Smolensk crash.

The charge was filed with Poland’s Attorney General by German lawyer Stefan Hambura, on behalf of the son of crash victim Anna Walentynowicz, according to daily Rzeczpospolita. Mr Hambura was not available to comment on the case.

According to the paper, the lawyer argues that on the Prime Minister’s website following the April 10 catastrophe, it was indicated that Prime Minister Tusk and Russian President Dmitry Medvedev had agreed that the investigation would be conducted jointly by Polish and Russian prosecutors.

If the Polish PM and president-elect (acting president at the time) are responsible for withdrawing from this verbal agreement, the lawyer argues that they acted against the interest of the republic of Poland, a crime punishable by up to 10 years in prison.

In other legal news related to the crash investigation, Polish Attorney General Andrzej Seremet told radio TOK FM that the evidence might suggest the need to press charges against particular individuals concerning the preparation of the presidential flight.

“Please understand our cautiousness in this matter,” he pleaded, adding that detailed information would be presented to the Sejm next week.