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Muqrin's group had claimed responsibility for the gruesome murder of US hostage Paul Johnson who was executed after the Saudi government failed to meet its demands to release jailed militants

Eye on Politics & Law Lords: Terror fears spark plan to seal off Parliament
Intelligence chiefs are calling for the most sweeping security shake-up in the history of Westminster to prevent terrorists striking at the heart of central London.
Amid fears that government departments and tourist landmarks such as Big Ben are under threat, intelligence experts want to set up a 'sterile security zone' around a large swath of London, blocking off key roads and sealing off the Commons debating chamber with bomb-proof screens.
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