Britain on Monday downgraded its security threat level from "critical" to "severe", the domestic intelligence service MI-5 said.
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The government raised the threat level to "critical" - the highest of five levels - on Thursday before arresting 24 people who were allegedly plotting to blow up US-bound passenger jets.
The threat level had been held at "severe" for about a year, after the tight security that immediately followed the July 7, 2005 attacks on London's transport network had been relaxed.