Police say they arrested a 17-year-old man late Tuesday in connection with the shootings in the Bricktown entertainment district the previous night.
A pregnant woman was hurt but not shot in the incident. Authorities say one person remains in critical condition. The others are in good condition.
Police also arrested 19-year-old Rodney Hill in the shootings. Both suspects face eight complaints of shooting with intent to kill. Formal charges have not been filed.
Police are looking for more suspects.
Thousands of people were in the area after the Thunder-Lakers playoff and police are seeking cellphone video of the shooting. Police say the shootings were not connected to the NBA game.