The number of death and other details that you need to know about the latest US elementary school shooting in Oregon have been explained. A teenager shot and killed three children and a teacher on Thursday at an elementary school in the US state of Oregon, police said, adding the assailant was later killed by an armed bystander who pursued him into the building. Key points and original sources are listed below.

• The number of death and other details that you need to know about the latest US elementary school shooting in Oregon have been explained. It was very sad.S1

• A teenager shot and killed three children and a teacher on Thursday at an elementary school in the US state of Oregon, police said, adding the assailant was later killed by an armed bystander who pursued him into the building. Officers rushed to Silver Rail El...S2