(CNN) A Chicago house party devolved into chaos when a dispute led to the shootings of 13 people -- possibly at random, police said.

The 13 victims range from 16 to about 48 years old, said Fred Waller, chief of the Chicago Police Bureau of Patrol.

Four of the victims -- including the 16-year-old -- are hospitalized in critical condition. The other victims are in stable condition, Waller said.

The melee broke out around 12:35 a.m. Sunday in the 5700 block of South May Street.

"This incident stemmed from a dispute within that party," Waller said. "This party was given in the memory of a subject that was slain in April. We're still developing details as far as that goes."

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