The security source said there are no plans to raise the terror threat level in the United Kingdom from severe to critical.

该消息也提到英国并不打算将恐怖威胁级别从严重提高到特别严重。

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The official terror threat was at the severe level for four years after the July 7 bombings in London in 2005. It was downgraded last July.

本次官方恐怖威胁是自2005年7月7日的那次爆炸以来，是四年内等级最高，最为严重的一次威胁。这次威胁的严重性已超越7月分的那次爆炸。

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The current terror threat level has been classed severe - one level lower than the highest "critical" - since 14 August 2006.

BBC: NEWS | UK | Two car bombs found in West End

The terror threat level on the UK Home Office website remains unchanged at "substantial, " which is the third highest of five levels.

CNN: London's Olympic security headache

France increased its domestic terror threat level after French forces went into action in Mali on 11 January to push back militants who had captured Timbuktu and other parts of northern Mali.

BBC: A French soldier patrols a street in Paris, 15 January