According to a draft Homeland Security Department plan obtained by The Associated Press, the public could see the warnings on Facebook and Twitter.
The colour-coded system has been one of the government's most visible counter-terrorism tools since the September 11, 2001 attacks.
The government's terror warnings could be withheld from the public entirely if announcing a threat would risk exposing an intelligence operation or a current investigation, according to the government's confidential plan. The new system is expected to be in place by April 27.
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