In the wake of last week’s mass shooting in California that left 14 people dead, U.S. officials said Monday they will unveil a new alert system to warn Americans of potential terrorist attacks.

Department of Homeland Security Secretary Jeh Johnson said during a livestreamed forum with Defense One, a website that covers security issues, that the specific changes to the country’s terror alert system would be announced in the coming days. He did not provide a release date.

America is currently using the National Terrorism Advisory System (NTAS), which was adopted in 2011. It replaced the color-coded advisory system implemented following the 9/11 attacks.

During the Defense One event, however, Johnson noted that the NTAS has never been activated “because it depends on a specific, credible threat to the homeland.” He said triggering an NTAS warning required “a pretty high bar” to be met, and that’s why no advisory was ever issued.

He said that in this day and age there needs to be “an intermediate level” in a warning system.

“We need to do a better job of informing the public at large of what we are seeing, removing some of the mystery about the global terrorist threat, and what we are doing about it and what we are asking the public to do,” Johnson said during the Defense One event.

Johnson’s comments come days after the husband-and-wife team of Syed Rizwan Farook and Tashfeen Malik opened fire during a holiday office party in San Bernadino, California, killing 14 people and injuring 21 others on Wednesday. The FBI is investigating the shooting as an act of terrorism and trying to determine if the couple was inspired by any foreign terrorist groups.