The FBI has arrested an 11th person in connection to an alleged “ambush” at an Immigration and Customs Enforcement detention center south of Dallas.

Ten people have been arrested so far in a “planned ambush” of U.S. Immigration and Customs Enforcement officers in north Texas. On July 4, the Alvarado Police Department announced that one of its police officers had been shot in the neck after responding to a call without stating the incident occurred outside of an immigration facility.

Federal officials announced new charges in connection with an alleged coordinated attack against a North Texas ICE detention facility.