The man accused of shooting three people to death and wounding nine others at a Planned Parenthood clinic in Colorado last month declared himself guilty and a "warrior for the babies" during an outburst in court on Wednesday.

The disturbance, as prosecutors formally presented murder and other charges against Robert Lewis Dear, 57, bolstered assertions by Planned Parenthood executives that the attack on the Colorado Springs clinic was motivated by anti-abortion sentiments.

Dear has been held without bond since surrendering to police at the end of a five-hour siege on Nov. 27 that authorities said began when he opened fire with a rifle in front of the clinic, then stormed inside.