MELROSE PARK, Ill. (Reuters) — A gunman opened fire at an engine manufacturing plant Monday, killing as many as three workers and wounding four others before shooting and killing himself, authorities said.

The shooting erupted in a testing area at the Navistar International Corp. engine manufacturing plant west of Chicago.

Melrose Park Mayor Rod Serpico told NBC-TV four people, including the gunman, were dead.

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Serpico described the gunman as a former employee who fellow workers said had left the company about two years ago after being accused of theft.

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