A sword-wielding attacker, who entered a high school in central Sweden on Friday, was arrested after killing one person and injuring three others. The attack happened while classes were taking place, officials said. Key points and original sources are listed below.

• A sword-wielding attacker, who entered a high school in central Sweden on Friday, was arrested after killing one person and injuring three others.S1

• The attack happened while classes were taking place, officials said.S2

• Hundreds of students were attending classes at the school when an 18-year-old with a sword attacked multiple people, police sayS3

• Swedish police shot suspected swordsman after an attack on a secondary school on Friday that has left at least two people seriously injured. breitbart.com/">Breitbart.S4