The warning was issued as protests erupted across the nation over the Supreme Court’s decision Friday morning to overturn half a century of abortion rights. In an ominous incident Friday night, a truck driver in Cedar Rapids, Iowa, rammed into demonstrators protesting the court’s ruling, and one demonstrator was hospitalized.

In an earlier National Terrorism Advisory System bulletin Friday, the department warned: “We expect violence could occur for weeks following the release [of the decision], particularly as DVEs [domestic violence extremists] may be mobilized to respond to changes in state laws and ballot measures on abortion stemming from the decision. We base this assessment on an observed increase in violent incidents across the United States following the unauthorized disclosure in May of a draft majority opinion on the case.”

A May bulletin warned that extremists might try to infiltrate the reproductive rights movement, ABC New reported.