The 12th suspect wanted in connection with a July 4 ambush that left a police officer wounded outside an ICE detention facility in Alvarado, Benjamin Hanil Song, is in custody, the Johnson County District Attorney and the FBI said Tuesday.

The suspect, a former U.S. Marine Corps reservist, is accused of joining 11 others in an organized attack against officers at the Prairieland Detention Center.

A Blue Alert was issued on Wednesday for a man accused of shooting an Alvarado police officer during an attack at a U.S. Immigration and Customs Enforcement detention facility on July 4, according to the Texas Department of Public Safety and the FBI.