Military personnel wait for a press conference to begin at Ft. Hood, Texas, April 2, 2014
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Fort Hood shooting leaves four dead

A soldier shot dead three colleagues and injured 16 others at the US Army's Fort Hood base in Texas before killing himself, the military says.

US media named the suspect as Ivan Lopez, 34, although his identity has not been officially confirmed.

The gunman had served in Iraq and had mental health problems, officials said.

Philippa Thomas reports.

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