Authorities have secured the area but have not found the gunman. Photo: Reuters
Three officers have been injured in an "active shooter" incident in the US city of Colorado Springs, police say.
An unknown number of civilians may also have been hurt, Police Lieutenant Catherine Buckley told local TV. Officers at the scene say they are still encountering gunfire, Colorado Springs police said in a tweet.
The incident is taking place near a Planned Parenthood clinic, but it is not clear whether the building itself has been targeted.
"When officers arrived they did encounter active gunfire. We do have three officers that are injured. We do not know the extent of their injury. We have an unknown number of civilians that are injured," Lt Buckley told KKTV.
"We do not have the shooter at this point but we do have all of our resources brought to bear," she added. She said police did not know if hostages had been taken, but said it was possible.
The manager of a nearby haircut salon, Denise Speller, said she heard as many as 20 gunshots in under five minutes.
She told a local newspaper that she saw one of two police officers appear to fall to the ground and the other attempt to get the wounded officer behind their police vehicle.
KKTV reported that three shooting victims were being taken to the city's Penrose hospital and "an unknown amount of other victims" were being taken to Memorial hospital, also in Colorado Springs. The station said their condition was unknown.
Police have told shoppers at a nearby centre to stay indoors.
Planned Parenthood said it was monitoring the situation. "Our concern is for the safety of our patients, staff and law enforcement," said its CEO Vicki Cowart.