Former Polish Prime Minister Jaroslaw Kaczynski, the identical twin brother of late Polish President Lech Kaczynski, has announced that he will run for the presidency:
The BBC's Adam Easton in Warsaw says his brother could benefit from a significant sympathy vote in the wake of the tragedy. Parliamentary Speaker Bronislaw Komorowski, who became acting head of state after the crash, had been preparing to run against Lech Kaczynski.
Opinion polls have suggested that Mr Komorowski will defeat Mr Kaczynski in the snap election on June 20. The election was called after the president, his wife and 94 senior officials were killed in a plane crash in Russia on 10 April.
If elected president, Kaczynski would also face up against Prime Minister Donald Tusk, who defeated him in a 2007 election.
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