This is the 6159th most frequent Korean word.
수사기관에
"To investigative agencies."
Here, 수사기관에 denotes the indirect object of the verb 신고하다 (to report). It specifies the entity where the action of reporting was directed.
수사기관에 신고한 사건이 해결되었습니다.
The case reported to the investigative agency has been resolved.
In this sentence, 수사기관에 functions as the recipient of the information, emphasizing the connection between the data provider and the agency.
수사기관에 제공한 정보가 도움이 되었습니다.
The information provided to the investigative agency was helpful.
This usage of 수사기관에 indicates the entity with which the subject plans to cooperate, implying interaction or collaboration.