The mother (3rd L) of Liliya Kalashnikova, 30, a victim of Lame Horse nightclub fire, is helped by relatives during a burial ceremony at a cemetery outside Perm, 1,150 km (720 miles) east of Moscow, December 7, 2009. Russia observed a national day of mourning on Monday for the 112 victims of a weekend nightclub blaze, as investigators stepped up their probe into fire safety breaches and burials continued in Perm. REUTERS/Denis Sinyakov (RUSSIA DISASTER)