shooting spree; mass shooting
Refers to an incident where a person fires a gun indiscriminately, often in a public place, causing multiple casualties. Used in news and formal contexts.
A mass shooting incident occurred in the city last night.
The suspect in the shooting spree has been arrested.
無差別殺傷 is a broader term for indiscriminate killing or wounding, not limited to firearms.
Compound of 銃 (gun) and 乱射 (random shooting).