UPDATED 06/11/12 5:48 a.m.

CHICAGO (CBS) – At least eight people were killed and 40 others were injured in separate shootings in a violent weekend in Chicago.

In the latest deadly shooting, two people were killed and three others were wounded when gunshots rang out around 11:15 p.m. Sunday in a party in the Back of the Yards neighborhood.

Police say rival gang members were at a gathering in the 700 block of West 50th Place, when a fight started and somebody pulled a gun.

One man, Shondell Adams, 21, of the block where the shooting happened, was shot multiple times and was taken to Stroger Hospital of Cook County, where he was later pronounced dead. Another, Jonathan Duncan, 22, of the 5200 block of South Racine Avenue, was shot in the head and also died at Stroger Hospital.

Three others were hospitalized in good condition. A 28-year-old man was shot in the arm and taken to Holy Cross Hospital, a 20-year-old woman was shot in the foot and taken to Provident Hospital of Cook County, and a 16-year-old boy was shot in the arm and taken to Provident Hospital.

Around the very same time, two men and a woman were shot a couple of miles to the southeast in the Washington Park neighborhood. A gunman shot a 33-year-old man in the back, a 27-year-old woman in the leg, and a 27-year-old man also in a leg in the 100 block of East 60th Street, police said. All were reported in good condition.

The latest incidents capped off a violent weekend in many areas of the city, particularly in South Side neighborhoods.

• At 2:20 a.m. on Sunday, Donnell Smith, 49, suffered a gunshot wound to the abdomen in the 7500 block of South Drexel Avenue in the Grand Crossing neighborhood, authorities said. Smith, of the 8100 block of South Talman Avenue, was pronounced dead at Stroger Hospital at 10:11 a.m. on Sunday, the medical examiner’s office said.

• Around 8 p.m. Saturday, Joseph Briggs, 16, was shot on his front porch in the 6100 block of South Rockwell Street in the Chicago Lawn neighborhood, police said. Shots were fired from a gray vehicle about 8 p.m., police said, adding that the shooting might be gang-related.

Briggs was pronounced dead at 1:40 a.m. at Advocate Christ Medical Center in Oak Lawn, according to the Cook County Medical Examiner’s office.

• In broad daylight Saturday morning, a man was killed and his brother was wounded when someone in another vehicle opened fire into their car in the Roseland neighborhood. Around 10:20 a.m., they were sitting inside a sedan parked on 111th Street near South Edbrooke Avenue when a dark-colored sport-utility vehicle drove up and someone inside fired shots, police said.

Derrick Wilkerson, 21, of the 11800 block of South Indiana Avenue, was shot in the chest and later pronounced dead at Advocate Christ Medical Center in Oak Lawn, authorities said. His 19-year-old brother suffered gunshot wounds to the arms and was reported in stable condition, police said.

http://chicago.cbslocal.com/2012/06/10/10-arrested-for-downtown-muggings/

• The second fatal shooting happened about 12:49 a.m. on Saturday during an apparent robbery attempt, according to police.

• Around 12:49 a.m. Saturday, Kenneth J. Jones, 27, was shot and killed around 12:49 a.m. Saturday in what police believe was a robbery attempt in the 6800 block of South Indiana Avenue, in the Park Manor neighborhood.

Jones lived in the 3800 block of South Indiana Avenue.

• Around 4:43 p.m. Friday, two men were killed and three others were wounded in the 5100 block of South May Street, again in the Back of the Yards neighborhood.

The five were standing outside when two unknown males approached them on foot and fired shots, police said in a statement.

Rashuan Stephany, 22, of the 1300 block of West 49th Street, and Mario Jackson, 26, of the 5100 block of South Morgan Street, died a short time later at Stroger Hospital, according to the Cook County Medical Examiner’s office.

An 18-year-old man shot in the buttocks and a 24-year-old man shot in the hand were also taken to Stroger, police said, adding that both men were in stable condition.

Police said someone drove a fifth victim — a 39-year-old man — to Provident Hospital of Cook County, where he was listed in good condition with a gunshot wound to the arm.

In all, at least 40 people — mostly men — suffered non-life-threatening injuries in separate shootings on the South and West sides since Friday afternoon.

The overnight hours from late Saturday to early Sunday alone saw 20 people wounded, many of whom were injured in shootings that hurt multiple people, police said.

Just two separate shootings in the Lawndale neighborhood — in the 1300 block of South Avers Avenue and the 3300 block of West Douglas Boulevard — left 10 people wounded late Saturday and early Sunday. The most seriously hurt was a 17-year-old who shot in the abdomen in the the Douglas Boulevard incident, and taken to Mount Sinai Hospital in serious condition.

The Sun-Times Media Wire contributed to this report.

(Source: Sun-Times Media Wire © Chicago Sun-Times 2012. All Rights Reserved. This material may not be published, broadcast, rewritten, or redistributed.)