British security source cites intelligence about possibility of attack being planned . The overall , national terrorism threat level remains at `` severe . '' - The UK government is not aware that the US has any plans to carry out a terrorist strike in Britain, but it does have contingency plans for such an event. Second source : Increased security precautions in effect at transportation hubs . Security threat level hiked to `` severe '' for civil aviation , London transport .
British security source cites intelligence about possibility of attack being planned . - The UK government is not aware that the US has any plans to carry out a terrorist strike in Britain, but it does have contingency plans for such an event. Second source : Increased security precautions in effect at transportation hubs . Security threat level hiked to `` severe '' for civil aviation , London transport .