Last week, a bus was hijacked and set on fire by young people faithful to Unionist groups in Northern Ireland. Cars were burned. Groups threw bricks and bombs at each other, and at police. And although the death of Prince Philip may have put a chill on the clashes, that chill may only be temporary. “We know the summer months can be divisive,” Andrew Sanders, a professor at Texas A&M San Antonio, told Inside Edition Digital. “We know that it's likely that there's going to be trouble."