This is the 18010th most frequent Korean word.
수사한다고
"수사한다고" means "investigate" or "conduct an investigation."
In this sentence, '수사한다고' conveys that the action of investigation will be carried out by the police.
경찰은 사건을 철저히 수사한다고 발표했습니다.
The police announced that they will thoroughly investigate the case.
Here, '수사한다고' expresses a belief or thought about someone performing an investigation.
그는 자신이 수사한다고 믿었습니다.
He believed that he himself was conducting the investigation.
In this instance, '수사한다고' is used to relay a claim regarding the manner of investigation.