People lay flowers as they attend a rally to commemorate the victims of a bomb explosion at Domodedovo airport, in central Moscow January 27, 2011. Russia's Prime Minister Vladimir Putin vowed revenge on Tuesday for a suicide bombing that killed at least 35 people at Russia's busiest airport and underscored the Kremlin's failure to stem a rising tide of attacks. REUTERS/Nikolay Korchekov (RUSSIA - Tags: POLITICS OBITUARY CRIME LAW CIVIL UNREST IMAGES OF THE DAY)