United States Attorney General William Barr said on Monday that the fatal shooting of three Americans by a Saudi Air Force officer at a Florida naval base last month was “an act of terrorism,” and confirmed a report that 21 Saudi military trainees will be pulled out of the US, following an investigation into the incident.

Barr told a news conference “The evidence showed that the shooter was motivated by jihadist ideology. During the course of the investigation, we learned that the shooter posted a message on September 11 of this year stating, ‘The countdown has begun.’” He also said the shooter posted anti-American, anti-Israeli and jihadi messages on social media as late as two hours before the attack.