TORONTO - Nearly 20 people gathered outside the Toronto offices of the Canada Border Services Agency today to protest the ongoing detention of three alleged terror suspects being held without charge.

The protesters, some of them clad in orange jumpsuits, want Ottawa to free Mohammad Mahjoub, Mahmoud Jaballah and Hassan Almrei, who are being held on the grounds they pose a potential threat to national security.

Protest organizer Matthew Behrens says the three, who have been on a hunger strike for more than a month to protest their detention at a facility in Kingston, Ont., are entitled to see the evidence against them.

Mahjoub's wife, Mona Elfouli, tried to talk to an immigration officer only to be turned away by security officers, who repeatedly asked protesters to leave the building.

Elfouli says her husband, who hasn't eaten in 55 days, has been denied medical treatment for a double hernia.

The Supreme Court of Canada has been asked to rule on the constitutionality of security certificates, which allow federal authorities to detain suspects for security reasons without having to lay charges or disclose evidence.