 and then we sought assistance from our local counterparts for the outer perimeter, Cheadle said. As the investigation continued, officials with the FBI, the agency spearheading the probe, and the Department of Homeland Security warned late Monday about the potential for follow-on or retaliatory attacks. We cannot rule out the possibility some DVEs or other actors may attempt follow-on or retaliatory acts of violence in response to this assassination attempt. The two agencies sent a joint bulletin using an acronym for Domestic Violence Extremism.