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WASHINGTON (AP) — The U.S. government's color-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 color-coded system has been one of the government's most visible counterterrorism tools since the Sept. 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.