Jo Couzens, Sky News Online
The terror threat level in the UK has been raised from “substantial” to “severe”, meaning an attack is “highly likely”.
Home Secretary Alan Johnson sought to reassure the public, saying: “I have to emphasise the fact it does not mean an attack is imminent.”
He said the Joint Terrorism Analysis Centre (JTAC) keeps the threat level under constant review and makes its judgements based on a “broad range of factors”.
Mr Johnson said those factors include “the intent and capabilities