This is the 5861st most frequent Russian word.
расследовании
"Investigation."
In this sentence, 'расследование' is used as a noun to refer to the activity of systematically examining details and evidence regarding a specific matter, in this case, a theft.
Полиция проводила расследование дела о краже.
The police conducted an investigation into the theft.
Here, 'расследование' again indicates the systematic procedure being concluded, emphasizing the completion and its results.
Расследование завершилось успешно, и виновные были найдены.
The investigation was successfully completed, and the guilty parties were found.
In this sentence, 'расследование' continues its role as a noun mentioning the ongoing process or reports regarding corruption investigations.