Possible meanings are 1) "everywhere in the country God is judging people because they violently killed others" or 2) "the courts everywhere in the country are murdering people." The word "blood" here represents murder and death. (See: [[rc://en/ta/man/translate/figs-metonymy]])
The city is spoken of as if it were a container, and violence is spoken of as an object that can be put in a container. The abstract noun "violence" can be translated as a verb. AT: "violence is everywhere in the city" or "many people in the city are doing violent things to others" (See: [[rc://en/ta/man/translate/figs-metaphor]] and [[rc://en/ta/man/translate/figs-abstractnouns]])