Watch Police 999: Clear and Present Danger

In north Wales, neighbours rung 999 after being woken up by the noise of a bare-chested man throwing tiles from a rooftop, and confrontation with the police sends sparks through the air as he sets his trousers on fire.

In Essex, a routine investigation into a vehicle collision with a motorbike takes a turn for the worse when one of the drivers decides to throw the officer on the ground and try to escape through the roadside wood.

West Midlands, police approach two men on a city centre high street. One of the men aims a kick at an officer's groin. After a struggle, the police manage to contain the suspect, only to find out that the man has a shocking secret.

West Midlands, police receive a 999 call about a man armed with a gun. Officers on patrol spot the suspect and give chase. But when they corner the man, he pulls out the handgun and takes aim. Armed police arrive on scene, but can they detain him without firing a shot?

Northamptonshire, police are searching for a suspected gunman. A lone officer approaches a male in an empty carpark and is suddenly attacked during the routine search. A violent assault leads to the policeman being overpowered and his attacker strangling him. Back-up is on its way, but will it get there in time?

South Wales, police are called to a disturbance in a block of flats and are confronted by a man brandishing two large kitchen knives. Officers contain him behind safety doors and begin negotiating with him. But as the incident escalates, police realise that they might have to use taser to protect both themselves and the man.