Russian President Dmitry Medvedev announced on Saturday a national day of mourning after President Lech Kaczynski, his wife, and an official delegation of senior officials were killed in a plane crash in western Russia.
"On behalf of the Russian people, I express the deepest, most heartfelt condolences to the Polish people, and compassion and support to the relatives and friends of the victims," Medvedev said, addressing the Polish people.
"On Monday, April 12, Russia will hold a national day of mourning."
Polish Prime Minister Donald Tusk and Russian Prime Minister Vladimir Putin are currently on their way to the site of the crash.
The Soviet-made Tu-154 hit trees as it approached Smolensk airport in thick fog.
Kaczynski was on his way to a ceremony in Katyn to commemorate the memory of some 20,000 Polish officers killed by Soviet troops during World War Two.
GORKI, April 10 (RIA Novosti)