UPDATE: 11:47 p.m. EDT — Chicago Police Department said the shooting incident at a Starbucks in the Uptown neighborhood was not random and they believe it stemmed from a drug transaction. The victim and the suspect are believed to know each other.

Original Story:

One man was killed and two others were wounded, including a 12-year-old boy, in a shooting Thursday night at a Starbucks in the Uptown neighborhood on the North Side of Chicago, authorities said.

The shooting happened around 8:10 p.m. EDT at Broadway and Lawrence at a Starbucks outlet located at 4753 N. Broadway, according to Chicago police and fire officials.

The deceased was shot in the body and was declared dead at the scene, police said adding that the 12-year-old was shot in the groin and was taken to Illinois Masonic Medical Center by ambulance immediately. Fire officials said the boy was in serious-to-critical condition.

Another adult male who was also shot and he self-transported himself to Weiss Memorial Hospital, police said. His condition is not yet known.

A witness told CBS local in Chicago that he heard gunfire and saw a suspect wearing a ski mask escape the scene after the shooting, reportedly running west on Lawrence.

Bryan Stroud, 52, of Ravenswood, who was one of the witnesses during the incident, said he just stepped outside the coffee shop to say hello to a friend and in a matter of moments they saw a man wearing a black mask entering the coffee shop and unload a .22-caliber handgun.

"He walked right in the store and just shot three people," Stroud said. "We were a little afraid. He could've come out and started shooting the crowd. Somebody went off the deep end," he added, according to the Chicago Tribune.

No one has been taken into custody yet. Police was expected to hold a news conference later on Thursday.