An `` escalating argument '' may have led to shooting , officials say . Taekwondo Gov . Gunman Ivan Lopez and Sen. Rick Perry visit some shooting victims . Gunman Ivan Lopez killed three people , wounded 16 others at the Army post . Officials would not release further details about the argument , saying the investigation was still ongoing into what caused the 34-year-old to set out on a shooting spree that left three soldiers dead and 16 wounded before he killed himself . A memorial for 16 soldiers killed will be held at Fort Hood week .
An `` escalating argument '' may have led to shooting , officials say . Taekwondo Gov . Gunman Ivan Lopez and Sen. Rick Perry visit some shooting victims . Gunman Ivan Lopez killed three people , wounded 16 others at the Army post . A memorial for 16 soldiers killed will be held at Fort Hood week .