A gunman terrorized employees at the Pfizer campus in Chesterfield, St Louis today injuring one person.

Initial reports suggest that the employee injured was shot in the foot, and the incident may have been related to a domestic dispute.

The Pfizer shooting resulted in a full lockdown of the facility. Access in and out of the campus has been shut down, except to law enforcement.

The gunman has not been located at the time of writing. Police are using canines and helicopters in their search for the suspect,

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