Russian and US agents have taken part in a joint operation to destroy drug laboratories in Afghanistan. The head of Russia's drug control agency said more than a tonne of heroin and opium was seized during the raids close to the border with Pakistan. Viktor Ivanov said the operation involved about 70 personnel from both countries including four Russian counter-narcotics agents, backed up by attack helicopters. He said the haul had a street value of 250 million dollars and was believed to have been destined for Central Asia. Russian officials have in the past accused coalition forces in Afghanistan of doing next to nothing to tackle drug production, and helping to sustain the estimated 2.5 million heroin addicts in Russia alone. Much of the heroin enters the territory of the former Soviet Union through Afghanistan's northern borders with Tajikistan and Turkmenistan. It then travels westwards across Kazakhstan, before entering the central and Ural regions of Russia, where there are large numbers of addicts.