(CNN) — Authorities have identified the man who opened fire at Fort Hood in Texas on Wednesday, killing three people before committing suicide, as Specialist Ivan Lopez.

Sixteen more people were injured Wednesday when he opened fire at Fort Hood, the sprawling Army post in Texas still on edge after a mass shooting there left 13 dead in 2009, officials said.

The gunman also died. He was engaged by military police before he fatally shot himself in the head, said the Army post’s commander, Lt. Gen. Mark A. Milley.

The suspect, a soldier who had served in Iraq, “had behavioral health and mental health” issues, Milley told reporters late Wednesday.

The general said there was no known motive for the shooting.

“There is no indication that this incident is related to terrorism, although we are not ruling anything out,” he said.

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