hold an inquiry; prosecute an inquiry; sit upon; lead an investigation (The criminal investigation was led by the FBI and consisted of two major phases. 4uzhoj); work the case (You know, there's a version of this, where you come work with me in Violent Crimes. You work cases the way you like, the right away, without... Well, without being a show pony Taras)

Игорь Миг

head the investigation

Dipl.

make an investigation

Drogen.sl.

conduct investigation

Makarow.

pursue an inquiry; carry out investigation

Recht.

make investigation

regier.

carry out an investigation (The Canadian Food Inspection Agency is now carrying out its own investigation. ART Vancouver)