DENVER — Robert L. Dear Jr., his pickup truck loaded with rifles, handguns and propane canisters, had to stop several times to ask for directions to the Planned Parenthood center in Colorado Springs. Eventually, he found the clinic’s address after calling Planned Parenthood itself, and once there, the police say, he carried out an hourslong shooting rampage that left three people dead and nine people wounded.

A Colorado court on Monday unsealed search warrants and an arrest warrant that offer a glimpse into the carnage of the Nov. 27 shooting and Mr. Dear’s violent anti-abortion views. He told the police that he had attacked the clinic because he was “upset with them performing abortions and the selling of baby parts.”

Planned Parenthood came under scrutiny in July after anti-abortion groups released secretly recorded videos and claimed the organization was illegally selling fetal tissue. Planned Parenthood has denied those accusations, and several state and congressional investigations have found no misconduct by the organization.

The documents unsealed on Monday in Colorado suggest that Mr. Dear had long admired violent opponents of abortion. After a standoff with the police, Mr. Dear was arrested and told a Colorado Springs detective that he revered Paul Hill, who was executed in Florida in 2003 for killing an abortion provider and his volunteer escort.