Kate Nash says the time known as “The Troubles” never really ended in Northern Ireland.

While the 1998 Good Friday Agreement brought an era of relative peace and prosperity to the U.K. region, paramilitary groups still exist and lower levels of violence continue to plague the community, says the 70-year-old grandmother who lost a brother in the 1972 Bloody Sunday massacre.

Brexit may cause the smoldering conflict to flare up once again, she fears, especially if there are renewed customs and passport controls along the now-invisible border between EU member Ireland and the U.K.’s Northern Ireland after Britain leaves the European Union.

Read more: AP