The rampage that killed a woman and injured 3, including a police officer, is one of several violent incidents in the aftermath of two high-profile killings of black men by law enforcement.

Micah Johnson’s attack, the deadliest incident for police since 9/11, puts law enforcement on edge nationwide and changes the debate over excessive force and racial targeting.

Two women were injured in the attack in Richmond which left a state trooper and the gunman dead.