Department of Homeland Security replaced its iconic color-coded terror alert system on April 27 with a simpler version, according to homeland security officials.

Created in 2002 in response to the 9/11 terrorist attacks, the Homeland Security Advisory System featured five threat levels, which notified citizens of the probability of a terrorist attack.

The Homeland Security Advisory Council criticized the previous system as ineffective, lacking credibility and not clearly defining threat levels criteria.

Under the new system, there are two threat levels: imminent and elevated. The level is set to elevated when there is “a credible terrorist threat against the United States,” and imminent if there is “a credible, specific and impending terrorist threat against the United States.”

New alerts will also feature specific information, such as the nature of the threat, targeted infrastructure, location and suggested modes of transportation, according to the official DHS website.

Department of Homeland Security will also use social media to inform citizens with all alerts will be posted on the department’s Twitter feed, Facebook and blog.