The gunman who killed six people at Walmart was a store employee
Police believe the gunman died of a self-inflicted gunshot wound
Investigators sweep the store looking for victims or people hiding
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Police believe the attacker had a self-inflicted gunshot wound.
It is not known how many people were inside the store at the time of the shooting.
Six people including the shooter died in this attack.
Police said the store will remain closed until the investigation continues