Anti-nuclear campaigners are voicing their fears over trains carrying nuclear waste through London, warning of a possible "mini-Chernobyl".
The nuclear trains pass through many areas of London
The trains, which come from power stations in Kent and Suffolk, pass through areas including Willesden, Wembley and Islington in north London, Stratford in the east and Clapham in the south of the city.
They then head north towards the Sellafield reprocessing plant in Cumbria.
But campaigners say the trains are an unacceptable risk to the public as they pass through residential areas and want the Greater London Authority to stop them.
Mary Flannagan, from the Nuclear Trains Action Group, told BBC London 94.9 that assurances of safety were misguided, especially in a climate of heightened security.
"The tests carried out for this have only been carried out on computer simulations," she said.
"They are unsafe and undemocratic, in that no-one has been consulted about them.
We could be looking at a huge impact of radiation, deaths and illness right across the capital
Darren Johnson, leader of the Green Party on the London Assembly
"The trains have to be re-routed around London."
She said they will continue to protest at sites near to where the trains pass.
Darren Johnson, leader of the Green Party on the London Assembly, and chair of the committee that investigated the threat to London from transporting nuclear waste, warned of a catastrophe waiting to happen.
"We could be looking at a mini-Chernobyl," he said.
"We could be looking at a huge impact of radiation, deaths and illness right across the capital."
But London mayor Ken Livingstone, who recently declared the city "nuclear free", said the decision to halt trains going across London rests with central government.
A spokesman for the Department of Trade and Industry, which has responsibility for the safety and transportation of nuclear waste, said: "If there was a specific threat the trains would be stopped."