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Obama To Attend Fort Hood Memorial Wednesday

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AP Photo / Carolyn Kaster

Investigators say that an Army truck driver, Ivan Lopez, had an argument before opening fire at the Texas post last Wednesday, killing three soldiers and wounding 16 others before taking his own life.

Fort Hood's commander hasn't discussed the cause of the argument.

The attack was the second at the base since 2009, when 13 people were killed in a shooting by an Army psychiatrist.

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