The US sets a grim milestone with a new record for the deadliest six months of mass killings

Slain at the hands of strangers or gunned down by loved ones. Massacred in small towns, in big cities, inside their own homes or outside in broad daylight. This year’s unrelenting bloodshed across the U.S. has led to the grimmest of milestones: The deadliest six months of mass killings recorded since at least 2006.

From Jan. 1 to June 30, the nation endured 28 mass killings, all but one of which involved guns. The death toll rose just about every week, a constant cycle of violence and grief.

Six months....