Federal investigators think they know what started the fire that damaged the Albuquerque Old Navy Saturday morning. After officers tracked down David Hickman, a suspect they named on Monday, they ...

This file photo shows a half pound of Tannerite detonated under a car hood. It depicts a similar scenario to an exercise conducted at a rural training site that injured a firearms instructor. During ...

What to know about Tannerite and ammonium nitrate. — -- Tannerite and ammonium nitrate -- explosive materials -- were found among the suspected Las Vegas gunman's arsenal of weapons and ...

LORAIN, Ohio — Investigators found 100 pounds of explosives in the car of the man who killed a Lorain police officer and wounded two others last week, authorities said. The explosives were powerful ...