Chen said he heard Meng make the pledge at a conference carried on closed-circuit television.

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This includes manning X-ray machines, searching people, searching vehicles and operating closed-circuit television systems, he said.

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Mr Lin also tells Hong Kong's Ming Pao that his family home has installed closed-circuit television as a precaution against villagers.

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They should have been played on closed-circuit television for all U.N. delegates.

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"We've had considerable success in the past using closed-circuit television footage in order to trace the movements of the people involved, " he said.

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He imposed the fines via a closed-circuit television link to Ranong Provincial Prison, where the refugees will continue to be held until they can pay the court.

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He then traveled to the beach resort of Pattaya, where closed-circuit television cameras captured the three suspects staying at a budget hotel in the city before moving on to Bangkok.

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The staff were supposed to be doing tasks including venue perimeter security such as manning X-ray machines, searching people, searching vehicles, and operating closed-circuit television systems, G4S told CNN on Sunday.

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Israelis also monitor the crossing via closed-circuit television.

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The British are also likely to uncover a good deal about this plot because there are hundreds of closed-circuit television cameras in London, probably more than anywhere else in the world, and they might have picked up the attackers.

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