As the investigation begins into the deadly shooting at an ICE facility in Texas, a key step for authorities will be to figure out a motive.

“It is not going to be as straightforward as to having the person in custody and have them say, ‘I did it because of x,’” Kenneth Gray, a University of New Haven criminal justice professor, said.

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The suspect’s brother told NBC News he “didn’t think he was politically interested.”

Amid the search for evidence, the FBI director tweeted a photo of unspent rounds with the words “ANTI ICE” written on them.

“This is a new tendency towards leaving a message attached to the instruments used to conduct the murder,” Gray said.

Markings were found on casings in other recent high-prof

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