How do you say 'Call the police' in Chinese?

(快點)報警 ([kuai dian])[bao jing]. (the [kuai dian] is optional, but to mention urgency)

Breakdown:

[kuai dian]: hurry up

[bao jing]: to call the police

In short, 快點報警 is more like "hurry up and call the cops (police)".