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LONDON — British authorities raised the terrorism alert level Friday for airports, rail stations and other transportation hubs but left unchanged the threat level for the rest of the country, security officials said.
The officials said the measures were designed as precautions and there was no specific intelligence warning of an imminent attack, although the BBC reported it had seen a government letter to aviation officials suggesting that al-Qaeda “may be considering an attack.”
The specific threat assessment for transportation hubs was increased Friday from “substantial” to “severe,” the officials said. The threat level for Britain as a whole has been at “severe” for a year, according to Scotland Yard.
