Probably sent them a stern letter of admonition.
Along with an apology and an offer to create a new safe space for them where whitey can't go.
Nothing that severe. Really. The students got note placed in their files that will be removed when they graduate, with no record of disciplinary action having been taken against them. If they riot again next year they run the risk of receiving a toothless letter of reprimand, but the administration does not apply such stringent measures against first-time offenders.