After a Saudi pilot opened fire on U.S. military personnel in Naval Air Station Pensacola last week, killing three, the Pentagon has ordered a halt to bringing in any new international military students until a more thorough screening process can be implemented. According to Pentagon Spokesman Jonathan Hoffman, no formal ban has been put into place, but no new students will be allowed entry into the nation until the necessary changes have been made.

“If something else were to happen and we had not taken steps to address and enhance our vetting and screening, that would be unacceptable to the American people and we should be held to account for that,” Hoffman said.

Last week’s shooting saw Saudi Air Force 2nd Lt. Mohammed Alshamrani, 21, open fire in the naval base where he was a student, killing three and injuring ten others. Investigators have yet to definitively say whether or not Alshamrani acted alone, but about a dozen of his fellow Saudi students remain confined to the base amid the ongoing investigation. The FBI has stated that until evidence arises that supports a different supposition, the incident is being investigated as a terror attack. Alshamrani died after a shootout with the sheriff’s deputies.

The investigation that followed suggests that the Saudi national had been radicalized as far back as 2015. This begs some hard questions about the vetting process for foreign students aboard U.S. military installations. He also apparently had an interpersonal conflict with an instructor at the school that led him to file a formal complaint after being referred to in class as “porn stache.” Alshamrani was able to legally acquire a Glock handgun after getting his hunting license in the state of Florida — a loophole that even surprised Florida’s governor.