Passengers walk past flowers left on a floor in memory of those killed in Monday's blast at Moscow's Domodedovo airport January 25, 2011. A suspected suicide bomber has struck at Russia's busiest airport, killing at least 35 people and challenging Kremlin efforts to crush armed insurgency and tackle growing nationalist tensions in the country's heartland. REUTERS/Tatyana Makeyeva (RUSSIA - Tags: CRIME LAW TRANSPORT)