UK threat level raised to `critical` after subway bombing
(World News UK)

A homemade bomb planted in a rush-hour subway car exploded in London on Friday, injuring 29 people and prompting authorities to raise Britain`s terrorism threat level to `critical,` meaning another attack may be imminent. The early morning blast sparked a huge manhunt for the perpetrators of what police said was the fourth terrorist attack in the British capital this year. ......