British police say they arrested five people under anti-terrorism laws after stopping a vehicle that drove near a nuclear site Monday in northwestern England.
Prime Minister David Cameron has told the country to be on high alert for possible attacks in retaliation for the U.S. killing of terrorist leader Osama bin Laden in Pakistan.
The Cumbria police said in a statement Tuesday that Civil Nuclear security officers had detained the five men, all aged in their 20s, and had taken them to Manchester for questioning by a police counter-terrorism unit.
The Sellafield nuclear site no longer houses an active power station, but it stores and processes spent nuclear fuel.