>> A mass stabbing on the streets of London. A 19 year old man, armed with a knife, arrested on suspicion of murder after a woman died on Wednesday night, six other people injured in the attack. Police say the subject may be mentally unstable, but that they haven't ruled out the possibility of terrorism.
Britain counter terrorism unit has been called in to help investigate. Armed police were called to the scene in Russell Square at 10.30, they arrived five minutes later using a teaser gun to subdue the suspect before arresting him. Britain's threat level is already at severe, meaning a strike is highly likely.
The incident came just hours after police promised to deploy more armed officers to the capital after attacks in other parts of Europe. London Mayor Sadiq Khan called for calm, urging the public to be vigilant and alert.