Minneapolis, MN (NBC News) - Investigators in Minneapolis say the gunman who shot and killed his boss and three others Thursday had been fired from his job earlier in the day.
Grief surrounds the Accent Sign Company where the shooting took place.
The shooter has been identified by family as 36-year-old Andrew Engeldinger.
He took his own life in the company's basement.
Engeldinger stood out to other employees at the company.
"The one that was doing the shooting was a quiet, kept to himself kinda guy. Kinda odd," said former coworker Heather Buckingham.
Police still had the plant cordoned off Friday while they worked to collect evidence.
"Unfortunately, it's a horrible wait and our thoughts and prayers go out to the families of the victims and friends of the victims, a lot of them have been out here," Inspector Mike Martin said.
Police say a search of the suspect's house turned up packaging for 10,000 rounds of ammunition.
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