After the criminal case of online fraud is filed, will the police deliberately delay handling the case?

Criminal investigation generally has a time limit of 37 days. Under special circumstances, it is necessary to apply to the procuratorate for extending the investigation period, and reasonable reasons are needed. Secondly, even if you apply for an extension, you can only apply for it twice, so it is possible to extend it, but it is generally not done. The charge of online fraud depends on what type it is, whether it is an accomplice or a trust crime, etc.