6 Relatives Dead in Apparent Murder-Suicide at Texas Home
U.S. News & World Report - 04/06/2021
A mass killing where two siblings are the perpetrators is rare, said James Alan Fox, a criminologist at Northeastern University.
“In these situations, mass killing, it’s usually one perpetrator,” he said.
The Associated Press/USA Today/Northeastern University Mass Killing Database has recorded 452 incidents of mass killings — the slaying of four or more people — from 2006 through Sunday, he said. He said nearly half of those — 217 — were mass killings where someone killed their family members.