The man accused of opening fire at a Planned Parenthood clinic in Colorado reportedly said "no more baby parts" while he was being arrested.
The reports by NBC News and other US media have fuelled speculation the attack was linked to a controversy around Planned Parenthood's role in delivering fetal tissue to medical researchers.
However, there has been no official word on what motivated the man who mounted the attack in which three people were killed.
The media reports cited unidentified law enforcement sources.
British boxer Tyson Fury has beaten champion Wladimir Klitschko to snatch the Ukrainian's world heavyweight titles.
Fury won on points at the fight in Dusseldorf, becoming the first Briton to hold a world heavyweight crown since 2009.
Undefeated Fury, who improved his record to 25-0, now has the WBA, WBO, IBF and IBO belts.
Planned Parenthood have vowed to quickly reopen the Colorado Springs abortion clinic attacked by a gunman on Friday.
Three people were killed in the attack including police officer Garrett Swasey. Nine others were injured when the gunman, named as Robert Dear, open fired at the clinic.
Vicki Cowart, regional director of the company, said they would learn from the attack and "square our shoulders" as she spoke at a vigil for the victims.
Cowart confirmed all 15 employees at the clinic survived and worked hard to get others in the building to safety.
She received a standing ovation as she walked up to the church pulpit to address the room. At the back, someone held a banner that read "Women's bodies are not battlefields. Neither is our town."