在有争议的决定之后，城市里爆发了一场骚乱。

A ___riot broke out in the city after the controversial decision.

紧张局势导致了一场暴力的种族骚乱。

The tension led to a violent race ___riot.

城市地区爆发了一场骚乱，但警察及时干预了。

A ___riot started in the urban area, but the police intervened promptly.