Police said a man carrying a shotgun walked right by a pair of officers who were in an unmarked vehicle around 1 a.m. near 54th Street and Normandie Avenue.
The officers approached the suspect and told him to drop his weapon. Detectives said the man turned around and shot at the officers. The officers were not hurt. They fired back, but it's unknown if the suspect was injured.
The suspect took off on foot. His shotgun was found at an Arco gas station. It's unknown if he has any other weapons on him.
Police set up a search perimeter, but after several hours, there was no sign of the suspect.
DEVELOPING: We will add more details to this report as they become available.