Essex commuters heading into London will see even more armed police on duty today after a suspected terrorist knife attack.
A woman was killed and five other people were injured in Russell Square late last night.
Scotland Yard says a 19-year-old man is under guard in hospital after being tasered.
The Mayor of London, Sadiq Khan, has issued this statement:
“The safety of all Londoners is my number one priority and my heart goes out to the victims of the incident in Russell Square and their loved ones.
“I have spoken with the Commissioner, and the Assistant Commissioner, who have assured me that our police officers are working extremely hard to investigate exactly what has happened and to keep the rest of us safe. A man was arrested at the scene. Police have spoken to him and are seeking to establish the full facts including motives for this attack.
“I urge all Londoners to remain calm and vigilant. Please report anything suspicious to the police. We all have a vital role to play as eyes and ears for our police and security services and in helping to ensure London is protected.
“Our police officers are doing an incredibly difficult job on our behalf and they have my full support.”
The Metropolitan Police say they were were called at 22;33 hours last night (Wednesday, 3 August) to reports of a man seen in possession of a knife injuring people at Russell Square, WC1.
Officers attended the scene along with the London Ambulance Service.
Up to six people were found injured at the location.
A female (no further details) was treated at the scene but was pronounced dead a short time later.
We await an update on the condition of the other persons injured and details of any other injuries. A man was arrested at 22;39 hours and a Taser was discharged by one of the arresting officers. Additional police units have been deployed to the area to provide reassurance.
Anyone with information should contact police on 101 or call Crimestoppers anonymously on 0800 555 111.
Terrorism is one possibility being explored at this stage.