London terror attack: Policeman stabbed in face after rushing to confront three terrorists
Officer first on scene after responding to calls for help from public

A single police officer was stabbed in the face as he took on the three attackers behind to the terrorist rampage at London Bridge.
The British Transport Police officer was attacked and injured as he waited for back-up from armed police.
Emergency services rushed to the scene following reports of a vehicle ploughing into pedestrians around London Bridge and stabbings at Borough Market shortly after 10pm.
The officer, who was on duty, was one of the first on the scene after he responded to calls for help from the public, the force said.
A spokeswoman said it was believed he was targeted by one of the three attackers who were later shot dead by police.
BTP said in a statement: "He received injuries to his head, face and leg, which, at this time, are believed to be serious but not life threatening."
"The officer is currently being treated in a central London hospital and his family are with him while he receives treatment."

No other BTP officers are thought to have been injured in the incident.
Chief Constable Paul Crowther, who visited the officer with divisional commander Chief Superintendent Martin Fry, asked the public to stay "calm, vigilant and alert".
He said: "Again, our thoughts and sympathies are with those who have been injured in and affected by this horrific incident, including one of our own.
"We have implemented our strategic command structure and are working closely with the Metropolitan Police Service and other agencies in these early stages of the investigation.
"We would ask the public to remain calm, vigilant and alert, and to report any suspicious behaviour to the police on 0800 789 321."
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