A father used a ghost gun to kill his three daughters. It’s a sign of a growing crisis

A sheriff's deputy puts up crime scene tape following a shooting at a church in Sacramento, California, last month. Photograph: Fred Greaves/Reuters

A California man who shot and killed his three daughters, a chaperone who was supervising a visit with the girls and then himself last month was armed with a ghost gun, law enforcement officials revealed.

David Mora Rojas was visiting his daughters Samarah Mora Gutierrez, nine, Samantha Mora Gutierrez, 10, and Samia Mora Gutierrez, 13, at a Sacramento church on 28 February when he opened fire. Nathaniel Kong, 59, an employee of the church who was supervising Mora Rojas’s time with the children, was also killed.