An anti-nuclear group from Cumbria is protesting in London today.
Radiation Free Lakeland is opposed to the idea of an underground nuclear waste store being built in the county.
They are planning to demonstrate outside the Department of Energy and Climate Change.
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Early enquiries suggest the men may have taken the drug Blue Valium. Two of them remain in hospital with breathing problems.
More than 8,000 people are expected to attend over the three day event, which starts at 7pm tonight.
The local MP and leader of the Liberal Democrats says it was a "joyful" day for locals and former locals alike.