Smartphone users may have received the alert as a notice on their phones.
Once a user swiped into the story, it became apparent this was only a test.
The alert was issued by NOAA and was sent to users on the Gulf Coast and East Coast.
This is what the alert looked like for ABC11's sister station WABC.
The National Weather Service Tsunami Warning this morning was a TEST. No Tsunami warning is in effect for the East Coast of the U.S.— AccuWeather (@accuweather) February 6, 2018