US President Donald Trump has threatened to escalate his crackdown on immigration - pledging to "permanently pause migration" to the US from all "third world countries" as he hit out against his country's "refugee burden".
Trump's social media post came after he announced that a US National Guard member had died after a shooting in Washington DC - for which an Afghan national has been blamed.
He did not give further details or name which countries might be affected. Such a plan could face legal challenges and has already prompted pushback from UN agencies.
The president's announcements after Wednesday's fatal attack represent a further toughening of his stance towards migrants during his second presidency.
