REVERE (CBS) – Police are searching for the gunman who shot a person in Revere Thursday night. The incident started as an argument between seven or eight people on Dehon Street when one person pulled out a gun.

Revere Police Chief James Guido says the suspect fired one shot. According to I-Team sources, the victim was shot in the torso.

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State Police say the victim, who was located by troopers on a nearby street following the shooting, is reported to be in critical condition.

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SWAT Team responds to shooting on Centennial Ave in Revere (WBZ-TV)

Guido says there is video of the incident, and they are confident they know who the gunman is. A SWAT team was called in to search the apartment building where police believe the suspect lives but no one was located.

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One additional person who was involved in the incident has been arrested, but it is unclear what they have been charged with.