In the middle of a grand, high-ceilinged church in Orebro, Sweden, Jacob Kasselia, a Syrian orthodox priest, looked up towards the stained glass windows above him, then back down at his hands. He adjusted the gold cross hanging from his neck."The police say this man acted alone," the priest said. "But this hate, it is coming from somewhere."A member of Kasselia's congregation, 29-year-old Salim Iskef, was among those murdered in Orebro on Tuesday in Sweden's first school shooting and the worst mass shooting in the country's history. The gunman killed 10 students at an adult learning centre and then himself.