Two people were killed and two others wounded in a shooting Sunday in the East Side neighborhood.

About 3:50 p.m., three men, 39, 27 and 20, were standing in the 10000 block of South Avenue M, when an unknown vehicle pulled up and two males jumped out, Chicago police said. Both males pulled out weapons and fired shots at all three men.

The 27-year-old man, who is a valid concealed carry license holder, pulled out his own weapon and returned fire, fatally striking one of the shooters, 17-year-old Michael E. Portis, police and the Cook County medical examiner’s office said. Portis, who lived in South Shore, was dead at the scene.

The other male got back into the vehicle and sped off, police said.

Elvis Garcia, 39, was struck in the leg and abdomen and rushed to the University of Chicago Medical Center, where he was pronounced dead, authorities said. He lived on the city’s Southeast Side.

The 20-year-old man was struck in the right arm and taken to Trinity Hospital, where he was stabilized, police said. The 27-year-old was struck in the left arm and taken to the same hospital, where he is listed in good condition.

Area South detectives are investigating.

Read more on crime, and track the city’s homicides.