A look at fatal attacks in anti-abortion violence in the US

Dr. David Gunn is shot to death outside an abortion clinic in Pensacola, Florida, becoming the first U.S. doctor killed during an anti-abortion demonstration.

John Salvi opens fire with a rifle inside two Boston-area abortion clinics, killing two receptionists and wounding five others.

—Jan. 29, 1998: A bomb explodes just outside a clinic in Birmingham, Alabama, killing an off-duty police officer and wounding several others.

Prominent late-term abortion provider Dr. George Tiller is shot and killed in a church in Wichita, Kansas, where he was serving as an usher; Tiller had been shot leaving his clinic 16 years earlier but survived.

—Nov. 27, 2015: A gunman kills a police officer and two people accompanying friends to a Planned Parenthood clinic in Colorado Springs.