CHICAGO (CBS) -- A man was killed and at least five more people were wounded when two gunmen opened fire outside a house party in the South Chicago neighborhood early Saturday.

It happened about 2:15 a.m. in the 8800 block of South Exchange, according to Chicago Police. Community activist Andrew Holmes said people at the party jumped from a second-floor porch and windows after two people started shooting.

A 20-year-old man shot in the chest was pronounced dead at the scene. The Cook County medical examiner's office has not released his name.

Another 20-year-old man shot in the groin was taken in critical condition to Northwestern Memorial Hospital, along with a 21-year-old man who was stabilized with an arm wound, police said.

Additionally, a 25-year-old woman was taken to Stroger Hospital with a graze wound to the head, a 22-year-old man shot in the hand went to Trinity Hospital and a 23-year-old man shot in the arm went to the University of Chicago Medical Center. Their conditions were stabilized, police said.

Detectives are trying to figure out a motive, find weapons and talk to witnesses.

Three hours earlier, an 18-year-old man was seriously wounded in another shooting a block away.

No one was in custody as Area South detectives investigate.

(Source: Sun-Times Media Wire © Chicago Sun-Times 2016. All Rights Reserved. This material may not be published, broadcast, rewritten, or redistributed.)