Ashley received her acceptance letter in February to study health care administration at Scarborough's Pures College of Technology, which is an affiliate of Northern College. Some 500 international students recently received an email informing them that their admission offers for this coming school year had been revoked, according to Northern College. Northern College says the problem was caused by Canada approving more visas for international students than expected. David Francis, director of strategic initiatives for Northern College, said it's the responsibility of Northern College to estimate how many visas will be approved ahead of each semester. Enlarge image (new window) A letter sent to some 500 international students from Northern College outlines that their acceptance offers had been revoked.