Number + 起 + Event Noun
The measure word 起 (qǐ) is used to count incidents, cases, or occurrences—especially accidents, crimes, or notable events. It pairs with numbers to quantify how many events took place. For example, 两起事件 means "two incidents."
上个月这条路上发生了三起交通事故。
Shàng gè yuè zhè tiáo lù shàng fāshēng le sān qǐ jiāotōng shìgù.
Last month, three traffic accidents occurred on this road.
警方正在调查一起盗窃案件。
Jǐngfāng zhèngzài diàochá yì qǐ dàoqiè ànjiàn.
The police are investigating a theft case.
今年已经报告了多起食品安全事件。
Jīnnián yǐjīng bàogào le duō qǐ shípǐn ānquán shìjiàn.
Multiple food safety incidents have already been reported this year.