1. Only after the Prosecutor has analysed the seriousness of the information and concluded that there is a reasonable basis to commence an investigation, can a ...
http://www.peaceandjusticeinitiative.org/implementation-reso...

2. The government and the police are coming under increasing pressure to open an investigation into allegations that a Roman ...
http://www.nytimes.com/2014/06/05/world/europe/feared-burial...
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3. prosecute = To pursue (an undertaking, for example) until completion; follow to the very end.
http://www.thefreedictionary.com/prosecute

In that case the Governor had ordered the Attorney-General to appear before a Grand Jury in New York County to prosecute an investigation of the State Police.
http://www.leagle.com/decision/197498878Misc2d910_1757.xml/P...

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W niniejszej sprawie wszczęto i przeprowadzono dochodzenie, w toku którego ustalono następujący stan faktyczny.

In the present case, an investigation was opened and prosecuted, during which the following facts were established: