investigation

extensive

Police launched an extensive investigation after the robbery at the city center bank last week.

carry out, conduct, pursue

Detectives are conducting a thorough investigation into the missing documents from last month.

reveal sth, show sth

The investigation revealed that the company had been overcharging customers for years.

on ~

On investigation, the company discovered that the faulty equipment had caused the factory accident.

under ~

The company's accounting practices came under investigation after auditors found several discrepancies.

~ into

The company began an investigation into why customer complaints had increased so dramatically last year.

the subject of an investigation

The company's accounting practices became the subject of a government investigation last year.