One report indicates that the administration blames far left ANTIFA and other leftist groups. This has not been confirmed yet. The other story blames far right anti-government groups looking for a “boogaloo”, meaning civil unrest and racial rioting. There are twitter feeds that are encouraging anti-government groups to join in along with trademark clothing.
The only thing that seems sure is that most of the arrests so far are from out-of-state agitators. I think there are groups on both sides that stand to “benefit” from a breakdown of civil peace. There is also evidence being checked that social media posts by foreign actors are trying hard to fan the flames.