A man questioned over an incident which saw threats made to kill Catholic students at an east Belfast college has been released without charge by police.
A PSNI spokeswoman said the man was released pending further enquiries.
Two men verbally abused students having a smoke break at Belfast Institute of Further and Higher Education at Tower Street on Monday, a spokeswoman said.
The college spokeswoman said sectarian threats were made before the men left but they returned armed with knives.
Sinn Fein education spokesman Michael Ferguson has met the college's chief executive to discuss campus security.
Three years ago the campus, which is in a loyalist area, was closed after masked men threatened Catholic students there.
The college said the students involved in Monday's incidents were attending performing arts courses.
CCTV footage of the incidents was being examined.