Speed (1994)

LAPD SWAT officers Jack Traven and Harry Temple thwart an attempt to hold an elevator filled with passengers for a $3 million ransom by an extortionist bomber, but as they corner the man in a elevator, he takes Harry hostage. Jack intentionally shoots Harry in the leg, forcing the bomber to release him. The bomber flees and activates a bomb which was strapped to himself, seemingly dying in the process. Jack and Harry are praised by Lieutenant “Mac” McMahon, with Harry being promoted to detective. Having survived the incident, however, the bomber watches the ceremony on TV from an unknown location.

The next morning, Jack witnesses a mass transit bus explode, killing the driver. The bomber contacts Jack on a nearby payphone, explaining that a similar bomb is rigged on another bus, which will activate once it reaches 50 miles per hour (80 km/h) and detonate if it drops below 50. He also demands a ransom of $3.7 million and threatens to destroy the bus if any passengers leave. Jack races through freeway traffic and boards the moving bus, but the bomb is already armed because the bus is over 50. He explains the situation to Sam Silver, the bus driver. However, a criminal on board, fearing Jack is about to arrest him, wildly discharges his gun, accidentally wounding Sam.