Two alleged antifa members have been indicted on terrorism-related charges for their alleged roles in a violent July 4 ambush at a federal immigration detention center in North Texas, marking what officials say is the first time such charges have ever been brought against antifa-linked suspects.

A federal grand jury in the Northern District of Texas returned the indictment, which was unsealed Thursday, charging Cameron Arnold and Zachary Evetts with providing material support for terrorism, attempting to murder federal and assisting officers, and discharging firearms during attempted murders.