OTTAWA - Prime Minister Stephen Harper and the other three federal party leaders will fly together to Poland for the state funeral of President Lech Kaczynski and his wife.

Harper invited Liberal Michael Ignatieff, New Democrat Jack Layton and Gilles Duceppe to accompany him to the Sunday funeral, and all accepted, said a release from the Prime Minister's Office.

Kaczynski and a cross-section of Poland's senior political and military figures were killed last Saturday in a plane crash.

The president was flying to services marking the 70th anniversary of the Katyn Massacre.

The tragedy was deepened because he had invited so many senior figures to accompany him, including the president of the national bank, the deputy foreign affairs minister, a senior military officer, a deputy parliamentary speaker and several lawmakers.

U.S. President Barack Obama and dozens of other world leaders are to attend the Kaczynski funeral.