The spillage was near the Bell Common tunnel and the M11 junction.

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The condition is not as common as carpal tunnel syndrome, which affects nerves in the wrist.

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After the incident at the San Jose mine, the Chilean government tightened mine security measures across the country, but injuries and deaths due to tunnel collapses and rockfalls remain a common problem.

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Mr Besson said he planned to work with the British government on a common strategy "to reinforce controls and make the passage by the (Channel) Tunnel or port as difficult as possible for illegal immigrants".

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