More details revealed on suspects in Independence Day ICE attack in Texas

Investigators continued on Tuesday to look into how the suspects were linked, including through a possible Signal group chat. Ten individuals are facing federal charges, including three counts of attempted murder of federal agents in addition to three counts of "discharging a firearm in relation to a crime of violence."

In addition, the U.S. Attorney's office charged an 11th suspect, Daniel Rolando Sanchez Estrada, with concealing evidence.

On Friday night, the heavily armed group lured two unarmed ICE agents into a parking lot by firing a barrage of fireworks at their door, and spray-painting graffiti on their personal cars with the words "traitor" and "Ice Pig," which agents could see from the cameras inside.

At around the same time, a police officer responded to their 911 call for two men firing rounds from a nearby tree line, and an officer was hit in the neck, which forced the agents to take cover. The officer who was hit is expected to recover, according to DHS.

Suspect Bradford Morris was arrested while trying to flee from the scene in a red Hyundai van. While in custody, he told an FBI agent he had been "part of a Signal Group Chat for a while and that he had been invited to the group chat years ago after attending a protest." He drove to the incident with another suspect and two people he only knew by their nicknames, "Champagne and Rowan." Inside Morris' van, police found a revolver, two AR-15 rifles, two Kevlar vests, a ballistic helmet and a loaded magazine.

Police also found seven suspects in black military fatigues wandering in a field 300 yards away, some of whom were covered in mud from trying to escape on foot. They also had weapons, vests and radios.

"One possibility is that they are related and this is a national concerted effort, to go after first responders," Alex Del Carmen, criminologist, told Fox 4 News Dallas-Fort Worth.

"The second possibility is that, in fact, this may not be related at all, and these are simply copycats, people are getting inspired to do this kind of harm to first responders because they're reading what's happening in other states," he added.

Another suspect allegedly had flyers in his backpack with "Fight ICE terror with class war!" and "Free all political prisoners."

"Threats or acts of violence toward law enforcement officers will NOT be tolerated. Secretary Noem has made it clear: If you threaten or attempt to harm a law enforcement officer, we will find you and prosecute you to the fullest extent of the law," the statement continued.

Fox News Digital reached out to the FBI and the Department of Justice.