US President Donald Trump said on Thursday he would suspend migration from what he called "third world countries", a day after an Afghan national allegedly shot two National Guard soldiers in Washington, killing one.

His social media post, which also threatened to reverse "millions" of admissions granted under his predecessor Joe Biden, marked a new escalation in the anti-migration stance.

Trump said earlier that Sarah Beckstrom, a 20-year-old West Virginia National Guard member deployed in Washington as part of his crackdown on crime, had died from her wounds.

The FBI has launched an international terror investigation as new details emerged about the alleged gunman, a 29-year-old Afghan national who was a member of the "Zero Units" -- a CIA-backed counterterrorism group, according to m

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