In the movie Zootopia, there is a sentence
More bad news in this city gripped by fear.
I figure we don’t need to know the context of the sentence because we all know that it means “The city falls into a great panic”. But I don’t understand the grammar of the sentence clearly, does it lack a linking verb? Is it more proper to say
More bad news in this city were gripped by fear.
Thanks a lot! explain: there was a similar post about headline, but it only told me a headline could be cut short, I still don't know how, so I posted this question.