A police search of Rajamangala University of Technology Tawan-ok grounds in Bangkok found a range of knives and some handgun ammunition, police said.
About police, led by the commissioner of the Metropolitan Police Bureau (MPB), Pol Lt Gen Samran Nualma, searched the campus after a video showing vocational students firing a gun into the air went viral on the internet on Wednesday.
Pathumwan police superintendent Pol Col Pansa Amarapitak said a team from the station was assigned to investigate the incident and concluded the video was shot at the university's Uthenthawai campus.
The students, he said, fired the gun as a salute to mark the campus's 88th anniversary on Feb 1.
Pol Col Pansa said officers found 15 9mm bullet casings and three .32 casings on a field on the campus grounds.
Around 2pm Wenesday, Pol Lt Gen Samran led 80 officers to search the campus and found weapons in an unattended bag at a building just off Phaya Thai Road.
A police source said three spartan blades, two long knives, eight 9mm firearm rounds, six .38 rounds and a helmet were in the bag.
The source also said police found 32 more knives and nine folding blades at another campus building.
The source said police checked the hands of eight students for gunpowder residue, to determine whether they were involved in the unauthorised gun salute.
Pol Maj Gen Samrerng Suanthong, deputy commissioner of the MPB, said he had talked to a teacher on campus who said such an incident had never happened before at the university.
He said the incident had drawn a lot of public criticism.
