It's the sort of thing you'd see in a drug murder with a message to convey. Or the kind of assassination that's repeatedly described in the 4 books of Islam (Mighty Mo had hundreds if not thousands of people murdered and assassinated).
About 20 years ago the Black Muslim factions in DC had a tiff, and the result was a similar slaughter on upper 16th Street NW. Everyone in the house had their throats slit. Men, women, children, infants.
The house was owned by Kareem Abdul-Jabar, as I recall......