DALLAS (AP) — Five individuals pleaded guilty Wednesday to terrorism-related charges after being accused of supporting antifa in a shooting that occurred outside a Texas immigration detention center in July, resulting in injuries to a police officer.

The charges, brought forth by the Justice Department, come after President Donald Trump officially designated the loosely connected movement known as antifa as a domestic terrorist organization. Trump has previously blamed antifa for various incidents of political violence.

According to the FBI, this case represents the first time that material support to terrorism charges have been invoked against individuals associated with antifa. The shooting incident involved gunfire and fireworks being directed at the Prairieland Detention Center, where the involved parties allegedly announced their intent before the attack.

Antifa, shorthand for 'anti-fascists,' refers not to a singular organization, but to an array of left-wing militant groups that aim to confront or resist neo-Nazi and white supremacist activities during protests.

Nathan Baumann, Joy Gibson, Seth Sikes, Lynette Sharp, and John Thomas each entered guilty pleas in a Fort Worth federal court for one count of providing material support to terrorists. They each face a potential maximum sentence of 15 years in prison.

Sharp's attorney noted that guilty pleas are merely initial steps in what could be a lengthy legal process leading to sentencing. The lawyers for the other defendants did not immediately respond to requests for comment.

The case continues as investigations remain active against additional individuals also involved in the shooting. Court documents reveal that during the attack, one participant urged others to secure rifles and opened fire, striking a police officer in the neck. Despite his injuries, the officer managed to return fire.

The shooting took place amid heightened immigration enforcement under the Trump administration. Shortly after the Dallas incident, another shooting event occurred at a Border Patrol facility in McAllen, Texas, further highlighting the escalating tensions surrounding immigration issues.