Police detain hundreds at Moscow opposition protest

Police detained over 800 people at an opposition gathering in Moscow on Saturday, 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.Most of those candidates and opposition leaders, in