共きょう同どう捜そう査さ

noun

joint investigation

Refers to an investigation conducted cooperatively by multiple agencies, such as police departments from different jurisdictions.

• 県けん警けいと警けい視し庁ちょうが共きょう同どう捜そう査さを始はじめた。

  The prefectural police and the Metropolitan Police Department began a joint investigation.