Also means
conduct an inquiry
Usage Note
Enquêter is used for police, journalistic, and official investigations. The related noun une enquête (inquiry, survey) is extremely common. Enquêter sur takes the preposition sur: la police enquête sur le meurtre (the police are investigating the murder).
Examples
"La police enquête sur ce crime depuis une semaine."
Natural Translation
The police have been investigating this crime for a week.

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