When a 15-year-old boy is murdered in New York City, cameras capture the attack. In Baltimore, police use a neighbour’s CCTV to solve a shooting.

A shooting in Mississippi leaves a man fighting for his life. Police use gunshot detection technology to track the shooter before he strikes again.

In New York City, surveillance cameras help find some bandits after a daring heist. In Colorado, cameras record a murder, robbery and subsequent arrest.

Surveillance cameras in Ohio capture a drive-by shooting in which a three-year-old boy dies. In Louisiana, a police officer’s son is shot dead in a nightclub.

Mississippi police turn to city-run cameras to identify suspects of a shooting spree. In Utah, a missing person's case becomes a murder investigation.

When a man is shot dead on the Fourth of July, detectives use social media to track down the killer. In Washington, police investigate a raging fire.