Translation:How is the city hall dealing with the public safety policy?
Have a look through some of these translations of "a prefeitura" taken from various sources: http://context.reverso.net/translation/portuguese-english/a%20prefeitura. "City Hall", "Town Hall" and "Mayor's Office" all get a mention together with a few other possibilities.
As I am in the UK, I would translate "a prefeitura" as "the local council" in this sentence. In other sentences it could mean the physical building where local government is housed which for us is the "Town Hall". In America "City Hall" works for both these meanings http://www.merriam-webster.com/dictionary/city%20hall.