Critical Incident

A police officer is stabbed in the arm as he tries to help a shopkeeper trapped inside a convenience store with a knifeman.

In Wiltshire, an officer fears for his life when a drunk man turns violent and threatens to kill him. The terrifying ordeal lasts for nearly 20 minutes as PC Mat Baker waits for backup to arrive. Elsewhere, a burglar deliberately drives straight at an officer who is trying to arrest him, breaking his leg, and a paramedic is attacked by a man after she refuses to give him a lift home.

In Edinburgh, PC Fraser Bell severs his artery while trying to restrain a youth, but his quick-thinking colleague saves his life by stemming the blood flow. In Manchester, PC Ian Bruce is part of a specialist team tackling vehicle crime. It's a dangerous job, and Ian finds himself alone and vulnerable as a gang he's chasing goes on the attack, using their car as a weapon.

A detective has a chemical thrown in her face as she tries to apprehend a gang of burglars, a police officer is injured as he tries to arrest a man who is threatening to kill officers with a machete, and a paramedic is headbutted by a patient.

PC Hayley Robinson has her ankle crushed after being driven at by a criminal in a car. But after five months of treatment, she's ready to go back to work. Elsewhere, fire crews across the country prepare for Bonfire Night - the worst night of the year for violent attacks on firefighters. And Saturday night revelry ends with a police officer needing stitches after an unprovoked attack.

A paramedic whose ambulance already had patients on board stops to assist in a road traffic accident. But as he tries to treat one of the people involved, he's headbutted so hard he's knocked unconscious. A rookie police officer experiences the darker side of the job when he is attacked by a patient he's guarding in a hospital.