European Commission President Donald Tusk testifies in Warsaw about the disaster which killed 96 including then-President Lech Kaczynski. Tusk was Prime Minister at the time. He is locked in disputes with Law and Justice over the crash.
Police use batons, pepper spray, tear gas and water cannon to disrupt activists expressing concern about the safety of a temporary warehouse in Gorleben where nuclear waste is being transported via train from France to Germany. It is thought to be the largest such mobilisation ever.
The body of Poland's First Lady, Maria Kaczyńska, is flown to Warsaw to lie in state alongside that of her husband, President Lech Kaczyński. Poland has seen an outpouring of grief since the couple and scores of other senior Polish officials died in a plane crash in western Russia on Saturday.
Polish President Lech Kaczyński lies in state in Warsaw as Russia marks a day of mourning and Poland appoints an acting head of the central bank to replace the one killed in Saturday's air disaster near Smolensk.