Another word for mass-murder

Dusty didn't think twice about offing anyone who posed a threat to him, and he didn't remember what it felt like to be a human who witnessed what looked like a mass murder.

Bianca looked down, recalling the mass murder with confusion.

It is mass murder against us.

Forty acres and two mules was promised 100 years ago as restitution for slave labor and mass murder of black people.

masterminding the bombing of Pan Am Flight 103, the worst terrorist mass murder in British history.