The Oregon slaughter of 10 people brings the total of mass shootings in the US this year - in which four or more people are killed or injured by gunfire - to 294. There have been only 274 days this year.

The shootings are captured in the calendar below, drawn from the Mass Shooting Tracker.

The tracker draws some criticism because its definition is broader than the FBI's definition, which requires three or more people to be killed by gunfire.