UK: Police officer firing plastic bullets at targets, aiming and reloading, at Specialist Firearms Training Centre

UK: Front view of police officer firing plastic bullets at Specialist Firearms Training Centre.

USA: Aerial view of New York district and Manhattan skyline, view of large steel globe, welcome to New York sign on the edge of the runway, car travelling over the Brooklyn Bridge, close up of flashing lights on top of a police car,NYPD police car parked on the street, Police oficer directing traffic

The Metropolitan Police Headquarters; New Scotland Yard building in London, England. Police van in the foreground.

Anonymous police marksmen practice aiming at targets at shooting range.

London, England. Low angle view of a rotating sign reading 'New Scotland Yard' and 'Working for a Safer London'. The Metropolitan Police headquarters; New Scotland Yard building in the background.

London, England. Close up view of rotating sign reading 'New Scotland Yard' and 'Working for a Safer London'. Metropolitan The Police headquarters; New Scotland Yard building in the background.

Policeman's hat on counter in police station with back view of male British police officer standing at desk in background

New York City, USA. Close up of a neon sign above police bureau reading; 'New York Police Department'.

Manhattan, New York City, USA. Angled view of a New York Police Department (NYPD) patrol car. Pan up to wide shot of Times Square. There is a US Armed Forces recruiting station in the middle of square.

London, England. Low angle view of rotating sign reading 'New Scotland Yard' and 'Working for a Safer London'. The Metropolitan Police headquarters; New Scotland Yard building in the background.

Two police officers driving a police security van along a road.

London, England: Night shot of police officers breaking down a door and entering the property during a police raid.

Manhattan, New York City, USA. Traffic Police standing on corner in Time Square. Steam escapes from a drain in the foreground.

Sequence of a police officer searching a man. The anonymous police officer pats down the anonymous man's trousers and shoes, and writes in their notepad. The police is wearing a bright yellow Metropolitan Police vest.

New York City, USA. A New York Police Department (NYPD) patrol car parked outside a police bureau. The police bureau bears a neon sign reading; 'New York Police Department' overhead. Traffic passes in the foreground.

London, England. Low angle view of rotating sign reading 'New Scotland Yard' and 'Working for a Safer London'. The Metropolitan Police headquarters; New Scotland Yard building in the background.

Metropolitan Police Headquarters; New Scotland Yard building London, England.

UK: Close shots of Heckler and Koch launcher and an AEP (attenuating energy projectile) - or plastic bullet - on a table

London, England: Various views of the exterior of the New Scotland Yard building, close up of rotating sign in front of building.

Wide view of the Place de la Concorde in Paris, France. An illuminated Christmas tree stands in the background with a policeman directing traffic in the foreground.

Various shots of Close Circuit Television (CCTV) cameras mounted on buildings.

London, England. The front door of number 10 Downing Street with a policeman standing guard outside.