A man armed with a sword severely injured two teenage boys, as well as a third person, at a Swedish high school on Friday, and one person was later detained, local authorities said, triggering a massive response from emergency services.The incident occurred on Friday afternoon at the Brinell high school, in the small town of Fagersta, in central Sweden.The school had just ‌opened after summer recess and for some students Friday was their first day at the senior high school.“We received an alarm at 2.06pm about suspected deadly violence and sent all available resources to the school,” a police spokesman said.The spokesman declined to comment on whether anyone had been killed, but said that one person at the scene was later taken into custody and that there was no longer any danger to the public.Jonas Cederberg, director of health and medical services for the Vastmanland county authority, said two people had arrived for treatment and were “seriously injured”.