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Chilling audio of the moment a gunman opened fire at a Planned Parenthood clinic has been released as it emerged the killer shouted 'no more baby parts' during his rampage.

A police officer and two visitors were killed when a man reportedly wielding an AK-47 stormed the abortion clinic in the US.

Around a dozen other people were injured in the shooting at the clinic in Colorado Springs, Colorado, on Friday morning.

Garrett Swasey, 44, died after a man reportedly wielding an AK-47 opened fire on the premises which has been targeted by pro-life demonstrators.

Armed police swarmed on the scene and following a five-hour siege the man surrendered.

The white, middle-aged man seen being handcuffed by officers has been named as Robert Lewis Dear.

(Image: REUTERS)

(Image: Reuters)

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A police spokeswoman, Lieutenant Catherine Buckley, said the exact motive behind the shooting remains unclear.

"We don't have any information on this individual's mentality, or his ideas or ideology," she said.

A number of people were seen evacuated from the building in blankets in the midst of the siege.

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(Image: REUTERS/Isaiah J. Downing) (Image: Twitter/Springs Police)

Buckley put the number of people taken to area hospitals at 11, including five officers.

The man was said to have given himself up after officers shouted to him into the building.

The building was then searched by the bomb squad as a number of unspecified items brought in by the gunman were examined.

(Image: ddp USA/REX Shutterstock)

A man in a white T-shirt, with his hands cuffed behind his back, being taken out of an armored police vehicle and placed in an unmarked squad car. Authorities said they believe the gunman acted alone.

"We did get officers inside the building. They were able to shout to the suspect and make communication with him and at that point they were able to get him to surrender and he was taken into custody," Buckley said.

(Image: ddp USA/REX Shutterstock)

An hour earlier, police said progress in securing the building was slowed by the fact that the gunman brought "some bags" with him into the clinic and left several items outside, all of which needed to be checked for possible booby traps or explosives.

After the arrest, Buckley said it would take hours more, and perhaps days, for investigators to fully process the crime scene.

Police swarmed the area around the building after an emergency call reporting shots fired at about 11.30am local time (6.30pm GMT), and officers ultimately confronted the suspect inside the building, Buckley said.

(Image: ddp USA/REX Shutterstock)

Television footage aired by CNN showed a number of clinic staff and patients being escorted safely into police vehicles from the building, which lies on the northwest side of Colorado Springs, about 70 miles south of Denver.

The FBI and agents from the US Bureau of Alcohol, Tobacco, Firearms and Explosives were assisting local law enforcement investigators.

(Image: ddp USA/REX Shutterstock)

President Barack Obama was notified of the shooting by his Homeland Security adviser, Lisa Monaco, and "will be updated on the situation as necessary, a White House official said.

The Planned Parenthood center provides abortions, screening for sexually transmitted diseases, pregnancy testing and other services, according to its website.

"We don't yet know the full circumstances and motives behind this criminal action," Vicki Cowart, president and CEO of Planned Parenthood Rocky Mountains, said in a statement.