Green is scheduled to make her initial appearance before U.S. Magistrate Judge Kelly Rankin in federal court in Cheyenne on June 2, where she will hear the formal charge.
Public records and Green’s Instagram account show no sign of opposition to abortion that may have motivated the crime, according to The Associated Press.
"We are grateful to the Casper Police Department, the ATF, and the FBI for their diligent work in pursuing the perpetrator of this heinous act of anti-abortion terrorism," the clinic wrote.