Four hospitalized after apparent overdose at River North club.

Four people were hospitalized in critical condition early Sunday after an overdose at a River North nightclub, according to the Chicago Fire Department.

Fire officials responded to the Sound Bar at 226 W. Ontario St. at approximately 2:50 a.m. Sunday. after reports of multiple overdoses at the nightclub.

Two men were taken to Rush University Medical Center, and another man and a woman were taken to Northwestern Memorial Hospital. All four were in critical condition, according to fire officials.

Additional information was not immediately available.

Check for updates.

adperez@chicagotribune.com