The RCMP have arrested two Montrealers over fears they could commit a terrorism-related offence.

El Mahdi Jamali and Sabrine Djermane, both 18, appeared at a Montreal courthouse this afternoon.

When Jamali appeared, he looked over to his family for support. His father blew kisses at him, and a friend nodded in support.

Sabrine Djermane appeared soon after him and was very composed.

CBC's French-language service, Radio-Canada, has confirmed that both are students at Collège de Maisonneuve, a CEGEP in Montreal's east end.

The two will remain in custody until their next court date, on Monday, although neither has been charged with any offence.

RCMP are requesting that Jamali and Djermane sign peace bonds, which would require them to abide by strict conditions or face jail time.

Jamali's lawyer, Marc Giroux, said this is the first time he's ever dealt with a case where police have arrested someone for fear of committing a terrorist act.

"Police officers are more sensitive to that reality, and I think it's kind of normal. [That doesn't mean that] the procedure is justified. That being said, the behaviour of the police is representative of the society we're living in," said Giroux.

Jamali and Djermane are to appear in court again on April 20, at which time more evidence is expected to be presented.

Today's arrests come within days of the arrests of two other Montrealers — Merouane Ghalmi, 22, and Daniel Minta Darko, 27. Both of them were also required to sign peace bonds over terrorism-related fears.

Ghalmi and Darko were ordered to wear GPS bracelets, allowing the RCMP to track their movements. They also handed over their passports and are not allowed to be in contact with each other.