Police say twin brothers living in Ottawa have been arrested on terrorism-related charges.

A Royal Canadian Mounted Police statement alleges that Ashton Carleton Larmond and Carlos Larmond, both 24, were planning to leave Canada to engage in terrorist activities abroad.

The RCMP says the brothers were both arrested on Friday — Carlos Larmond was detained at Montreal's Trudeau airport, while his brother was picked up in Ottawa.

Ashton Larmond is charged with facilitating terrorist activity, participation in the activity of a terrorist group and instructing to carry out activity for a terrorist group.

Carlos Larmond faces charges of participation in the activity of a terrorist group and attempting to leave Canada to participate in terrorist activity abroad.

Police did not specify which terrorist group the twins allegedly were involved with.