Homeland Security said investigators arrested an Afghan national who allegedly made a social media post about "building a bomb" and threatened to blow up a building in Fort Worth, Texas. Mohammad Dawood Alokozay's arrest took place on Tuesday, Tricia McLaughlin, an assistant secretary with DHS, said in a social media post Saturday. Alokozay was arrested on state terror charges and is being held at a corrections center in Tarrant County, Texas, according to court records. His arrest came just a day before two National Guard members were allegedly shot by another Afghan national -- 29-year-old Rahmanullah Lakanwal-- in Washington D.C. One of the Guard members, U.S. Army Specialist Sarah Beckstrom , later died from her injuries. Lakanwal is now facing a first-degree murder charge. McLaughlin

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