By Ted Hesson and Jasper Ward

WASHINGTON, Nov 30 (Reuters) - U.S. authorities believe the Afghan immigrant accused of ambushing National Guard members in Washington, D.C., was not radicalized until after he came to the United States, Homeland Security Secretary Kristi Noem said on Sunday.

Speaking on NBC's "Meet the Press" and ABC’s "This Week," Noem said authorities think that alleged shooter Rahmanullah Lakanwal was already living in Washington state when he became radicalized. Investigators are seeking more information from family members and others, Noem said.

Authorities identified Lakanwal, 29, as the........

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