Salt Lake City police have again delayed the release of a report into the Trolley Square mall shooting.

The report was expected to be released this week, but police said Wednesday that the report would be delayed until the deadline has passed for the last defendant in the case to withdraw his guilty plea, to avoid any legal issues.

Gun-dealer Westley Wayne Hill, 39, pleaded guilty last month to improper record-keeping when he sold a shotgun to Sulejman Talovic. In exchange for the plea, federal prosecutors dropped an illegal gun sale charge, and Hill was sentenced to a year's probation.

Talovic, 18, went on a shooting rampage at Trolley Square on Feb. 12, killing five people and wounding four others before dying in a shootout with police.

The Salt Lake City Police Department's official report of the shooting is expected to cover the events of the shooting and officers' response to it. The police chief has told the Deseret Morning News a motive for Talovic's killing spree remains a mystery.