In Warsaw, mourners wait to lay candles and flowers outside the Presidential Palace in memory of late Polish President Lech Kaczynski.
Members of Chicago's large Polish community have planned a funeral march and memorial Mass in honor of the 96 people killed in a plane crash last weekend.
Mourners will gather at 4 p.m. at St. Stanislaus Kostka Church and march to Holy Trinity Mission Church and Holy Name Cathedral.
In the evening, Cardinal Francis George will speak at a memorial mass presented in English and Polish at Holy Name Cathedral.
The Chicago area is home to an estimated 950,000 Poles -- the largest concentration of people of Polish descent outside of Poland. Numerous memorial events have been held here since the April 10 crash.
Chicago artist Wojciech Seweryn, who designed a statue about the massacre in suburban Chicago, also died in the plane crash.