OKLAHOMA CITY (AP) - A multicounty grand jury looking into how Oklahoma bungled the last two scheduled lethal injections will not be releasing a full report on its findings this week.

In a progress report released Thursday, the grand jury indicated the three days allotted this month didn't give them time to complete their investigation. The panel led by Attorney General Scott Pruitt's office will resume its work from April 12-14.

The grand jury has been meeting behind closed doors to find out why the wrong lethal injection drug was delivered to death row for the last two scheduled executions. One inmate was executed in January 2015 with the wrong drug, and a second inmate was just moments away from his scheduled lethal injection in September when prison officials noticed the drug mix-up.