Britain Raises Threat Level To "severe"
Link: Factbox: Britain raises threat level to severe | Reuters
LONDON (Reuters) - Britain on Friday raised its international terrorism threat level to 'severe' -- its second highest level of terror alert -- from 'substantial' on Friday.
There are five levels of threat:
* Critical - an attack is expected imminently
* Severe - an attack is highly likely
* Substantial - an attack is a strong possibility
* Moderate - an attack is possible but not likely
* Low - an attack is unlikely