Story highlights Company says it is "heartbroken" by the shooting

Victims include widower raising two teens; terrorism was not a factor in the shooting, police say

(CNN) The gunman in Monday's fatal shooting spree at an Orlando, Florida, business targeted his victims and had a "negative relationship" with at least one of them, according to law enforcement.

Army veteran John Robert Neumann, Jr. killed five employees of Fiamma Inc. before killing himself, Orange County Sheriff Jerry Demings said.

The company makes accessories for recreational vehicles. Neumann was fired from there in April.

He walked into the business Monday morning and pointed his gun at a new, temporary employee and told her to leave, Demings said.

"He was certainly singling out the individuals he shot," Demings told reporters Monday afternoon.

Officers gather in an industrial district of suburban Orlando, where multiple people were killed.

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