Police detain hundreds at Moscow opposition protest Police detain hundreds of people at an opposition gathering in Moscow, as authorities upped the pressure on top Kremlin critic Alexei Navalny by launching a criminal probe into his anti-graft group. Crowds walked along the capital's central boulevards in a protest "stroll" over the refusal by officials to let opposition candidates run in September polls for city parliament seats -- a local issue that has turned into a political crisis. IMAGES AND SOUNDBITES