"At 0300 hours Azar set off the first trip flare"

A trip flare is a device used by the military to secure an area. It consists of a tripwire linked to one or more flares. When the tripwire is triggered, the flares are activated, signalling that the perimeter may have been breached and illuminating potential attackers. In defensive positions, trip flares are usually placed in predetermined kill zones, with machine guns sighted on them.