The Canadian Police is heading up the $900 million security operation, the largest in Canada's history.

加拿大警方正在领导这项耗资9亿美元的安全行动，这是加拿大历史上规模最大的一次。

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There is a security operation under way.

那里正在进行保安行动。

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Unable to perform a security operation on an object that has no associated security.

无法在与安全性无关联的对象上运行安全性操作。

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And,to ensure that, a huge security operation has been put in place.

VOA: standard.2009.05.26

The rebellion has become increasingly violent. Worried by the growing security threat posed by the Maoists, the government is preparing to mount a big security operation called Operation Greenhunt to take out the insurgents.

VOA: standard.2009.11.04

So the whole security operation revolved around this point to eliminate this terrorist before he could blow his jacket and the security forces were very successful in eliminating this terrorist before he could blow up his jacket."

VOA: standard.2009.10.11

Authorities say the massive security operation is not intended to deter people from coming to Washington.

CNN: Authorities mount record security effort to ensure inaugural safety

The arrest is linked to an ongoing security operation at Britannia Crescent in the town.

BBC: Larne explosion 'linked to dissident republicans'

Intelligence agencies from 27 countries are sharing information as part of the security operation, said Gen.

CNN: Colombia steps up security for summit