following a three-month investigation, the state's forestry division released a report and briefing video on september 28, 2013, which found no evidence of negligence nor recklessness in the deaths of the 19 firefighters and revealed that an airtanker carrying flame retardant was directly overhead as the firefighters died. the investigation did find some problems with radio communications due to heavy radio traffic and the fact that some radios were not programmed with appropriate tone guards.