Quebec police, working alongside the Ontario provincial police, searched homes of two Lev Tahor sect members in Chatham, Ont. during a raid.
The raid happened late Wednesday, while journalists from the CBC's the fifth estate program were in the ultra-Orthodox Jewish community.
Police told all occupants of the houses to leave as officers searched for computers and other materials.
Officers were seen carrying away a box containing items seized in the search.
The action comes just days ahead of an Ontario court ruling on whether to seize and return 14 children to Quebec.
In court materials made public earlier this month, Quebec youth protection services alleged children as young as 14 had been married off.
The testimony in court alleged the children in the community could be in imminent physical and psychological danger.
The lawyer for the group denied the allegations.