The Missouri Public Service Commission says it needs more time before it issues a final report on a fatal explosion at a Kansas City restaurant.

The commission’s attorney, Robert Berlin, said Tuesday investigators have interviewed more than 60 people and conducted several tests. But he says some test results aren’t back and more investigation is needed.

The February explosion and fire destroyed JJ’s restaurant on the Kansas City Country Club Plaza, killing one person and injuring 15.

The commission was scheduled to issue the report June 27. A status report will be issued July 26. A deadline for the final report has not been set.

The commission is investigating whether Missouri Gas Energy was complying with state regulations at the time of the explosion.