noun
indiscriminate mass murder
Legal and media term for acts of mass violence without specific targeting, such as terrorism or spree killings.
無差別大量殺人は、国際社会で最も重い犯罪の一つと見なされている。
Indiscriminate mass murder is regarded as one of the gravest crimes in the international community.
その事件は無差別大量殺人として大きく報道された。
The incident was widely reported as an indiscriminate mass murder.
Compound of 無差別 (indiscriminate) + 大量 (large quantity) + 殺人 (murder). The exact historical derivation is uncertain; the term is a modern legal and journalistic construct.