The police warned me not to talk about what happened in the police station outside. What are the consequences if you tell me?

Since I don’t know what happened in the police station you said, I can’t help you make a judgment. If what you said is legal, then if you leak it, you will be suspected of committing a crime. If you commit the crime of leaking state secrets, the consequences are quite serious. If it is illegal, there will be no consequences. At the same time, you can (and are responsible for) reporting and complaining to the public security agency at the higher level of the police station or the Public Security Complaints Office or the Municipal Bureau Inspection Team. .If it involves the police station’s finances, dereliction of duty, or abusive lynching, you can directly report it to the local People’s Procuratorate (you must collect relevant evidence at the same time)