SIPE seems to be the police union, I imaging without more context therefore that the matter is some form of representative action by the union in connection with some criminal proceedings, but you will need to leverage the context to determine the exact meaning.

It begins with an accusation or an allegation which could later become a case trial.

SP: Empieza con una denuncia o una alegación que puede ponerse en un caso jurídico más tarde.

Following the asker's suggestion of 'arising out of,' something like this may be a little more closely aligned with authorial intent in this context, and be the 'closest natural equivalent' here.

Dispatch Outsource Res. 15 - The Village of Barrington Hillshttp://www.barringtonhills-il.gov
**arising from Case No. 10 L 143,** Gloria Lopez v. Village of Carpentersville, et al. presently pending in the Circuit Court of Kane County.

IN THE COURT OF APPEALS OF IOWA No. 3-639 / 12-1546 ...https://www.iowacourts.gov › media ›
Aug 7, 2013 — This is an appeal **arising from case number FECR 255691,** from Polk. County. On August 2, 2012, Edwin Mann pleaded guilty to domestic abuse.

IN THE UNITED STATES DISTRICT COURT
Georgia, Columbus Division, **arising from Case No. 16-40453** JTL. Case 4:17-cv-00057-CDL Document 15 Filed 06/01/17 Page 1 of 4 ...
https://www.govinfo.gov/content/pkg/USCOURTS-gamd-4_17-cv-00...