Authorities Believe They Identified Mystery Man in Brussels Bombings

The name was already on U.S. terrorism databases at the time of the attacks.

— -- Authorities believe they have identified the mystery man wearing the light-colored jacket in a photograph with two of the bombers at the Brussels airport, according to a U.S. official.

In recent weeks and months, there has been consistent chatter about other terror plots planned for Europe, with specific locations and targets being discussed, a senior intelligence official told ABC News. New attacks could come at any moment, the official added.

A third suspect, 24-year-old Najim Laachraoui, was on the run from police when he allegedly detonated one of the bombs at the airport. Belgian authorities posted a wanted notice for the Moroccan native the day of the coordinated Paris attacks in November that killed 130 people.

ABC News' Pierre Thomas contributed to this report.