Russians on Tuesday held impromptu memorial services at two subway stations in Moscow where suicide bombers conducted brazen attacks that killed 39 people and stirred fears of a revival of terrorism in the country's population centers.

The entire subway system in Moscow was open for the morning rush, but it was less crowded than usual as some nervous commuters delayed trips to work or stayed home altogether. At the landmark stations that were bombed, people deposited candles and flowers to honor those who died.

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