US media reported that up to three police officers were hurt in the incident.
News footage from the scene showed a sheriff's department SWAT team with an armored vehicle arriving at what an officer told AFP was an ongoing situation.
"A police operation is still under way," a police source in Colorado Springs said, adding that "multiple" people had been shot from outside the building.
"The area is NOT secure," Colorado Springs police said in a tweet.
Abortion is one of the services provided for women by Planned Parenthood and the association has become an lightning rod for criticism by social conservatives
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