The US government's colour-coded warning system is being replaced with a more specific and informative plan that would offer two levels of alerts -- elevated and imminent.
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.