Footage from the scene shows firefighters at work amid the wreckage
Polish President Lech Kaczynski and scores of others are believed to have been killed in a plane crash in Russia.
Officials in the Smolensk region said no-one had survived after the plane apparently hit trees as it came in for landing in thick fog. Several other government figures, including the army chief of staff, were also thought to have been on board.
They were in Russia to mark the 70th anniversary of the Katyn massacre, when the Soviets killed thousands of Poles.
The BBC's Adam Easton in Warsaw says the crash is a catastrophe for the Polish people.
He says Prime Minister Donald Tusk was reportedly in tears when he was told.
Plane 'hit trees'
The Russian emergencies ministry told Itar-Tass news agency the plane crashed at 1056 Moscow time (0656 GMT).
 Lech Kaczynski is thought to have been on board with his wife |
Smolensk regional governor Sergei Antufiev told Russian TV that no-one had survived.
"As it was preparing for landing, the Polish president's aircraft did not make it to the landing strip," he said.
"According to preliminary reports, it got caught up in the tops of trees, fell to the ground and broke up into pieces. There are no survivors in that crash.
"We are clarifying how many people there were in the [Polish] delegation. According to preliminary reports, 85 members of the delegation and the crew."
Russian investigators said there were a total of 132 people on the plane.
Controversial figure
