(CNN)An armed citizen gunned down a shooter at an Oklahoma City restaurant on Thursday, killing him, police said.

A man walked into Louie’s Grill & Bar and opened fire, striking two people. As the gunman was fleeing the scene, a bystander armed with a pistol confronted the shooter and fatally shot him outside the restaurant, Oklahoma City Police Captain Bo Mathews told reporters. “Right now, all I know is that it was just a good Samaritan that was there and looks like he took the right measures to be able to put an end to a terrible, terrible incident,” Mathews said.The shooter’s motive is not known and his identity has not been confirmed. Four people were injured during the shooting.Read MoreA woman and a girl were shot after the gunman walked into the busy restaurant. They were hospitalized and are expected to survive, Mathews said.The mother and daughter were celebrating a birthday when they were injured, CNN affiliate KOCO reported. A man broke his leg when trying to run out of the restaurant and a fourth person suffered a minor injury, police said.Police detained “a large number of witnesses” and said “there is no indication of terrorism at this point.”Louie’s Grill & Bar is in the northwestern part of the city. People were urged to avoid the area Thursday as police investigate the incident.A family reunification center has been established at the Lighthouse Center on W. Hefner Road.

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