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Discover LudwigSuggestions(5)
"opened an investigation" is correct and usable in written English.
You would use it when talking about someone beginning to look into a situation or issue to determine what happened or what needs to be done. For example: The police department opened an investigation into the robbery.
Exact(60)
The army has opened an investigation.
The police opened an investigation.
Prosecutors opened an investigation in 2013.
The authorities have opened an investigation.
Even so, that summer the hospital opened an investigation.
The dealer notified the authorities, who opened an investigation.
The Dutch federation, the KNVB, has opened an investigation.
"The French counterespionage service opened an investigation last week.
A prosecutor in Naples, Giovanni Melillo, opened an investigation.
The F.T.C. opened an investigation early that year.
The police have opened an investigation, local media outlets reported.
More suggestions(15)
opens an investigation
involved an investigation
presented an investigation
opening an investigation
commenced an investigation
proposed an investigation
initiated an investigation
opened an outlet
opened an episode
opened an office
opened an umbrella
opened an exhibition
opened an envelope
opened an employment
opened an account
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Since I tried Ludwig back in 2017, I have been constantly using it in both editing and translation. Ever since, I suggest it to my translators at ProSciEditing.

Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com