OKLAHOMA CITY (AP) - Oklahoma's multicounty grand jury has wrapped up a three-day investigation.

The grand jury issued a report Thursday that says it had heard testimony from witnesses and examined exhibits involving several cases since convening on Tuesday. But the panel said it did not have enough time to complete its work and took no action.

The grand jury will reconvene on June 12. Its meetings are closed and the nature of the grand jury's investigation has not been made public.

Since convening in January 2011, the grand jury has returned 17 indictments in cases filed in Cleveland, Harper, McClain, Pittsburg and Oklahoma counties. The panel has jurisdiction to investigate criminal matters in all 77 counties.

The previous grand jury issued 10 indictments while assisting 145 federal, state and local law enforcement agencies.