A large consignment of uranium - most of it highly enriched - has been flown to Russia from eastern Germany.
An armoured lorry was used to bring the uranium to the plane
Anti-nuclear protesters forced a convoy carrying the uranium to take a detour on its way to Dresden airport.
The protesters - about 30 in all - were heavily outnumbered by police escorting the uranium from a long-decommissioned research reactor at Rossendorf.
It is going to a reprocessing centre at Podolsk, outside Moscow. The shipment is part of a nuclear safety programme.
It is not clear if the uranium is sufficiently enriched to make a nuclear bomb.
The consignment of about 300kg (660 pounds) includes 200kg of uranium. A Russian transport plane took off with it early on Monday.
The fuel belonged to a research reactor built by the Soviet Union in the former East Germany, which was shut down in 1991, a year after German reunification.
The plan is to mix the highly enriched uranium with low-grade uranium - part of an international programme to prevent nuclear materials falling into the wrong hands.
The transfer was organised under a US-Russian programme of co-operation with the International Atomic Energy Agency (IAEA), called the Global Threat Reduction Initiative.