A leading official of the Chechen Government has been arrested in Denmark at Russia's request, Danish police have said. Ahmed Zakayev, an envoy of Chechen President Aslan Maskhadov and the region's deputy prime minister, was detained in Copenhagen where he was attending a world congress of Chechens. He is suspected by Russia of being involved in last week's siege by Chechen rebels of a theatre in Moscow, according to Danish television. Russian security forces have arrested 30 people - including several security officers - on suspicion of helping the Chechen rebels who took 800 people hostage in a Moscow theatre. The suspects include security officials and political advisers, who are alleged to have colluded with the Chechen hostage-takers, who stormed the packed theatre last week demanding the withdrawal of Russian troops from Chechnya.