The suspect surrenders to police six hours after the start of the attack in which six officers and six civilians were shot.
Three people including a police officer
were killed and nine wounded when a gunman opened fire at a family
planning centre in Colorado Springs.
The death of Garrett Swasey, 44, was announced "with great sorrow" by the Colorado Fraternal Order of Police.He was from the University of Colorado, about 10 minutes away from the clinic, and had responded to a call to help city officers.
Officer Swasey
In all, six police and six civilians were shot in the attack at the Planned Parenthood building in Centennial Boulevard.
"I want to convey to the loved ones of the victims: this is a terrible, terrible tragedy that occurred here in Colorado Springs today," Mayor John Suthers told reporters.
The standoff began shortly before midday local time on Friday and ended after six hours when the suspect gave himself up. He has been named as Robert Lewis Dear from North Carolina.
Colorado Springs police spokeswoman Catherine Buckley said the gunman had taken bags into the building, which was being searched amid fears they contained explosives.
She said he was armed with a "long weapon" with a shoulder stock such as a rifle, and some witnesses reported hearing automatic fire.
Many people were evacuated from the building but others were unable to get out.
Joan Motolinia said his sister, Jennifer, called him while hiding behind a table in the clinic and that he could hear gunfire in the background.
"She was telling me to take care of her babies because she could get killed," he said of the mother of three.
Quan Hoang, the owner of a nearby nail salon, told CNN that when he first heard shots fired he thought a local bank was being robbed.
"We see cops, SWAT, the bomb squad, a whole bunch of people just trying to take cover around the Planned Parenthood area," he said in a telephone interview.
"An officer came back in and said, 'Is everyone safe?' We asked him questions and he said they've barricaded him inside the Planned Parenthood and he was shooting out from the windows."
Planned Parenthood said it did not know if it was the target of the attack.
However, Vicki Cowart, president of its Colorado branch, said in a statement: "We share the concerns of many Americans that extremists are creating a poisonous environment that feeds domestic terrorism in this country."
Planned Parenthood operates hundreds of clinics nationwide providing services such as contraception, abortions and STD testing.
The non-profit organisation - which was rocked by claims it sells aborted foetal tissue for profit earlier this year - has been repeatedly targeted by pro-life activists.
