Two 18-year-old Montrealers have been arrested over fears they will commit a terrorist act, Le Journal de Montreal reports.

Sabrine Djaermane and Mahdi El Jamali appeared in Montreal courthouse and will remain in custody until Monday, Le Journal reported.

Charges haven't been laid, the Crown prosecutor said, but said that could change.

"There could be developments in the coming days," Lyne Decarie told the court.

No details about the allegations have been released.

This follows two other cases of people being arrested on suspicion of terrorism without charges being laid.

Last Friday, Minta Daniel Darko, 26, appeared in a Montreal court and agreed to wear a tracking bracelet after being suspected of terrorist activities. In March, Merouane Ghalmi, 22, agreed to the same release condition. Neither have been charged.