PHILADELPHIA — In a series of brazen attacks a few summers back, a man known as the “ruthless robber” stole money from his victims and then opened fire on them, leaving little behind but wounded ...

It’s a stark and alarming trend: Mass shooters engraving bullet casings with cryptic messages, leading officials to speculate about their motives and, more recently, their political affiliations. It ...

A new army research project aims to create small projectiles—bullets, mortar shells, handheld rockets—that can change their trajectory in mid-flight. Key Point: In the final phase, the army sees the ...