MOSCOW, Apr 20: Russian police detained at least 13 people who demonstrated outside a courthouse on Thursday against the arrest of three members of a women’s punk rock group that performed a protest song in Moscow’s main cathedral, witnesses said. The court was to decide whether to extend the detention of the three women over the performance, in which the group known as Pussy Riot sang a song against President-elect Vladimir Putin in short dresses and colored masks in Christ the Savior Cathedral. (agencies)