In pictures: Remembering Katyn massacre

A memorial has been opened in village of Katyn, near Smolensk in western Russia, marking the spot where more than 4,000 Polish army officers were massacred by the Soviet secret police in 1940.

In all, Stalin's secret police killed more than 15,000 Poles. Russia admitted it just 10 years ago

Hundred of Poles attended the ceremony, despite Polish press rumours that Russian railways were trying to restrict numbers

Polish Prime Minister Jerzy Buzek, left, leading a guard of honour, said Katyn would remain a symbol of genocide

Relations between Moscow and Warsaw have historically been tense, but the ceremony marked efforts to improve them

The names of those who died are inscribed on metal plates lining the walls of the site. Candles will be added later