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The majority of Rangers and Celtic supporters do not get involved in sectarianism, but serious incidents do occur with a tendency for the actions of a minority to dominate the headlines. The Old Firm rivalry fuelled many assaults on derby days, and some deaths in the past have been directly related to the aftermath of Old Firm matches. An activist group that monitors sectarian activity in Glasgow has reported that on Old Firm weekends, violent attacks increase ninefold over normal levels. An increase in domestic abuse can also be attributed to Old Firm fixtures.