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Lech Kaczynski and his wife were among 96 people killed when their plane crashed while trying to land in heavy fog in Smolensk, Russia, on April 10. The delegation included many high-ranking civilian and military leaders, and the loss of so many high-ranking people provoked deep grief across the nation. Many officials have called it the worst tragedy to strike the country since World War II.

More than 30 million of Poland’s 38 million citizens were registered to vote in nearly 26,000 polling stations across this eastern European country. Voting took place from 6 a.m. to 8 p.m. local time (midnight to 2 p.m. EDT). The first exit polls were released when the polls closed, and official results will come in later in the evening.

One opinion poll published Friday by the Rzeczpospolita daily newspaper showed Mr. Komorowski had the support of 42 percent of those surveyed, to Mr. Kaczynski’s 31 percent. The poll, by the GfK Polonia institute, had a margin of error of plus or minus 3.2 percentage points.

If no candidate reaches 50 percent, the two top contenders will compete in a runoff July 4.