OTTAWA (Reuters) – Canada’s antitrust regulator ruled that the merger between Rogers Communications (NYSE ) Communications and Shaw Communications should be stopped. This was on the grounds that it poses a threat of competition in Canada, and that Shaw Communications’ efficiencies were not sufficient to offset its anticompetitive nature.

According to the bureau, the sale of Shaw’s Freedom mobile wasn’t an effective way to end the merger.

Rogers and Shaw had earlier filed their petition with the Competition Bureau.