Pregnant woman among 4 killed in Brighton Park shooting, family says

CHICAGO (WLS) -- A 28-year-old woman who was seven months pregnant was one of

The two other victims were friends that he'd picked up to run an errand. The victims have relatives who lived in the area where the shooting occurred.

Step-mother Ana Arvizu said Ida Arvizu was reluctant Friday night to meet up with Joel Sandoval, who she recently broke up with.

Circumstances surrounding the shooting remained unclear Saturday, but investigators said the shooting appeared to be gang related.

No one was in custody Saturday in connection with the shooting.

Ald. Ray Lopez (15th Ward) said the shooter used an assault rifle.

"Weapons of war are winding up on the streets used by gang members to fuel their Facebook blood sport to see who can try to outdo who," Lopez said.

Witnesses described hearing heavy gunfire.

"Just heard the machine gun, probably 12 rounds go off and the first thing I did was duck down and hover over my mom and tell her to duck down because she was freaking out. Just as soon as I heard the last shot, I took off and called the cops," said one witness.