(CNN) -- A Chicago police officer was in surgery after being shot Saturday morning -- and officers are searching for whoever pulled the trigger, authorities said.
The officer was shot on the city's South Side -- the 1900 block of West 65th Street -- by someone who was believed to have been a fugitive, Chicago police spokesman Anthony Guglielmi said on Twitter .
The officer was taken to a hospital, where he or she was "completing surgery and is in stable condition," Guglielmi said .
"(The) offender has fled and is considered armed and dangerous," Guglielmi said .
Information about what led to the shooting wasn't immediately available.
Chicago police, US marshals and ATF agents are looking for the shooter, Guglielmi said.
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