Three people familiar with the federal probe into Kirk’s assassination told NBC News that investigators have yet to find a link between the alleged shooter and left-wing groups.

The federal investigation into the assassination of conservative activist Charlie Kirk has yet to find a link between the alleged shooter, 22-year-old Tyler Robinson, and left-wing groups on which Donald Trump and his administration have pledged to crack down after the killing, three sources familiar with the probe told NBC News.

One person familiar with the federal investigation said that “thus far, there is no evidence connecting the suspect with any left-wing groups.”