http://digbig.com/4mear
Mark Trevelyan, Security Correspondent
"The government's launch of a U.S.-style terrorism alert system will address concerns about lack of transparency but must avoid the pitfalls of "crying wolf" or being seen as a political tool, international experience shows. Authorities will on Tuesday introduce a five-layered threat system to inform the public, with levels ranging from low (attack unlikely) to critical (attack expected imminently)."
