U.S. authorities believe the shooter suspected of killing one National Guard member and seriously wounding another in Washington, D.C., was radicalized while in the U.S., Homeland Security Secretary Kristi Noem said.

Asked about the suspect’s motive, Noem said investigators are still collecting information and talking to his contacts.

“But I will say we believe he was radicalized since he’s been here in this country,” she said in an interview with NBC’s Meet the Press on Sunday. “We do believe it was through connections in his home community and state, and we’re going to continue to talk to those who interacted with him, who were his family members. So far we’ve had some participation.”

Federal authorities have identified the suspect as Rahmanullah Lakanwal, 29, an Afghan national who w

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