There were one thousand mass killings in the US by mid-2016.

Evidence

By June of 2016, unbelievable as it may seem, there had been one thousand mass killings (defined as four or more people shot in a single incident, excluding the shooter) in the US in twelve hundred and sixty days. — Jordan B. Peterson, 12 Rules for Life An Antidote to Chaos, 490

Categorization

• corroborated: 2 independent passages support this claim — Jordan B. Peterson, 12 Rules for Life An Antidote to Chaos, 490