People pass by a building destroyed by suicide bomb blast, with flowers and lit candles left in memory of the victims in front of it, in Vladikavkaz, September 10, 2010. President Dmitry Medvedev demanded tough action against militants on Friday after a suicide bombing killed at least 18 people, and an insurgent leader called for more attacks outside Russia's Muslim regions. REUTERS/Kazbek Basayev (RUSSIA - Tags: CRIME LAW CIVIL UNREST)