(CBS) – A man was streaming live video Thursday afternoon on Facebook when gunfire erupted, critically injuring him.

The incident occurred around 4 p.m. near 56th and Hoyne on Chicago’s South Side.

In a video posted online, the man holds his phone, taking a selfie, and makes comments. Then, gunshots can be heard; the man falls. With the phone still recording, a gunman appears, standing overhead.

The gunman  hovers, firing several rounds before stepping out of camera range. For several seconds, the only image is a stop sign and clouds rolling by in the sky.

The 31-year-old victim shot at the scene was transported to Mt. Sinai in critical condition, police said. He was undergoing surgery Thursday night.

Police say they are examining the video.

“I really do hate that it happened to him because he is a pretty nice kid,” Roger Frowner, a resident of the neighborhood who knows the victim, tells CBS 2.

“It’s crazy,” he adds. “I mean, a person can’t stand on the street corner enjoy the sunny day is simply outrageous. It’s a shame that people have to watch over their backs. The neighbors in the neighborhood have to duck and lay down on the floors in their own homes.”