A police officer checks the hand luggage of a woman as people wait in a line to pass through a metal detector 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: POLITICS CRIME LAW TRANSPORT)