The US Department of Defense (Pentagon) announced the tightening of restrictions on the possession of weapons by foreign military students on US bases, after the killing of three American sailors in Florida by a Saudi officer fire last month.
"Getting back to work does not mean returning to normal," Reuters quoted Gary Reid, a Pentagon intelligence official, as saying in a statement.
The Saudi officer, Mohammed Saeed Al-Shamrani, 21, opened fire at the Pensacola Air Force Base in Florida, killing three American sailors and wounding eight others.
After the attack, the Pentagon suspended training for Saudi pilots, and the training of about 850 visiting Saudi military personnel was restricted to classrooms.
Reid said that all military departments could fully resume training operations when implementing the new measures.
US Attorney General William Barr had described the shooting at the US air base as a "terrorist act".
And local media later reported that the authorities would expel more than a dozen Saudi military personnel trained in US bases, some of whom were linked to "extremist movements."
Investigations into the latest incident revealed that 15 students have contact with child pornography, and 17 of them have jihadi or anti-American material on social media.
On December 19, the Pentagon announced that it finds no threat after reviewing the cases of about 850 military students from Saudi Arabia studying in the United States.