Vehicle trips into or within the cordon area were projected to fall by 100, 000 a day and the average traffic speed to increase by 7%.

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Officials were seen rushing towards the buildings to cordon off the area.

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But he said the shortage of specialist officers would exacerbate the measures needed to maintain a cordon in an inner city area to prevent contamination being spread.

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East Park Road, at its junction with Leicester Street and Nottingham Road, remained closed for most of Tuesday as officers carried out further inquiries and a cordon would remain around the area, officers said.

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But a subsequent cordon and search operation in the same area unearthed the ragged, bearded fugitive.

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Student George Philip Todhunter Bramley, 20, from Gillingham in Norfolk: arrested and charged for Section 14 of the Public Order Act - breach of cordon and demonstrating in a non-designated area.

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Police set up a cordon at the church to conduct a further search of the area.

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Home Office officials have said in the event of an attack, the area immediately surrounding the scene, known as the "hot zone", would have an inner and outer cordon, with mobile shower units.

BBC: Warning over chemical attack 'cordon'