A Chicago police officer was fatally shot Wednesday during a chase on the city's south side, authorities said. 

The shooting occurred in the 5200 block of S. Spaulding Avenue around 4:45 p.m., Fox Chicago reported. A caller said a suspect was chasing a female with a gun, Police Superintendent David O. Brown told reporters. 

When officers arrived, one officer knocked on the door of where the call originated. A second officer engaged with the suspect and a chase ensued where gunfire was exchanged. 

"Earlier today, we lost one of our own. An on-duty police officer was fatally shot while responding to a person with a gun call. Please pray for this officer’s family, loved ones, partner and all of our Chicago Police officers who are grieving this tremendous loss," the Chicago Police Department tweeted.

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The 18-year-old suspect was struck in the head and an officer was hit multiple times. Both were taken to a hospital.

"This is a terrible tragedy for our city and we are mourning along with the officer's family," said Chicago Mayor Lori Lightfoot.

The officer was a five-year veteran of the police force who had a bright future ahead of him, Brown said. 

"There are some broken hearts that will take a long time to grieve, to accept this," he said.