Paramedics fear that a stabbing victim in a park has been wired with explosives; man threatens to jump from roof of construction site; reports of self-inflicted stab wound in Boston Common.

A married couple pull a drowning man from a bitterly cold river; EMTs work to calm a 6-year-old child who fractured his arm falling out of bed; a forgotten candle sets a building on fire.

The EMS is summoned to a tough neighborhood to treat two gunshot victims; a 2-year-old suffers a febrile seizure; a bomb squad is called to assess a suspicious package left outside a day care center.

A raging house fire threatens an entire city block; a pregnant woman is injured in a car accident; an EMT tries to convince the victim of a vicious assault to report the incident to police.

The team treats a man who has been shot in the upper thigh; a 9-year-old with a hand laceration; medics urge an elderly man to see a doctor.

A man collapses after experiencing chest pain; a man threatens to jump off a roof; a 30-year-old woman with a history of asthma has trouble breathing.