This is the 13973rd most frequent Polish word.
posterunkowi
"Posterunkowi" means "police officers" or "constables" (plural form, referring to lower-ranking officers).
In this sentence, 'posterunkowi' is in the dative case, indicating to whom the report was given, referring to the police officer.
Posterunkowi przekazano raport o wydarzeniach z ostatniej nocy.
The report about the events of last night was given to the officer.
Here, 'posterunkowi' is in the dative case as well, showing interaction or communication with the police officer.
Rozmawiałem z posterunkowi na temat bezpieczeństwa w okolicy.
I spoke with the officer about safety in the area.
In this use, 'posterunkowi' is again dative, demonstrating the object receiving gratitude or recognition.