Gunman in Marine slayings described life as ‘prison’ days before rampage

Investigators combed through social media and backtracked through the life of the gunman whose rampage left four Marines dead, seeking clues Friday on how a popular engineering student drifted to apparent despair in a world he described as a “prison.”

While no clear motive has been determined for Thursday’s bloodshed in Chattanooga, the probe delved into possible ties to Islamist terrorist groups or whether the attacker — 24-year-old Mohammad Youssef Abdul­azeez — acted independently in a half-hour spree of violence that ended with his death by apparent police gunfire.