The police called their families, but did not disclose information.

The reason is generally to prevent family members from damaging the evidence or tools of the crime scene after knowing the case, and to inform other criminal suspects in advance and other matters that hinder the investigation.

If you want to know the reason reasonably, you can entrust a lawyer to meet at the detention center to understand the case and indirectly get the reason for being arrested.

Legal analysis: in the investigation stage, it is illegal for the police to disclose the case and should be given administrative sanctions; If his behavior has constituted a crime, he shall be investigated for criminal responsibility according to law.

Legal basis:

Article 22 of the People's Police Law of the People's Republic of China stipulates that the people's police shall not commit any of the following acts:

(1) Spreading remarks damaging the reputation of the country, joining illegal organizations, participating in assemblies, processions, demonstrations and other activities aimed at opposing the country, and participating in strikes;

(2) divulging state secrets and police work secrets;

(three) practicing fraud, concealing the case, shielding and conniving at illegal and criminal activities;

(4) extorting confessions by torture, corporal punishment or maltreating criminals;

(five) illegally depriving or restricting the personal freedom of others, and illegally searching the body, articles, residence or place of others;

(six) extortion or soliciting or accepting bribes;

(seven) beating others or instructing others to beat others;

(eight) illegal punishment or charge fees;

(nine) accept the parties and their agents to treat and give gifts;

(10) engaging in profit-making business activities or being employed by any individual or organization;

(eleven) dereliction of duty, do not perform their statutory obligations;

(twelve) other violations of law and discipline.

"People's Police Law of the People's Republic of China" Article 48 The people's police shall be given administrative sanctions if they commit any of the acts listed in Article 22 of this Law; If a crime is constituted, criminal responsibility shall be investigated according to law. Administrative sanctions are divided into: warning, demerit recording, demerit recording, demotion, dismissal and dismissal. The people's police who are subject to administrative sanctions may lower their police ranks or cancel their police ranks in accordance with relevant state regulations. When necessary, the people's police who violate discipline can be taken to stop performing their duties and be confined.