A new report examining law enforcement’s response to a mass shooting at the Borderline Bar & Grill in Thousand Oaks reveals significant flaws in interagency communications and the tactical approach to the 2018 attack. Ventura County Sheriff Bill Ayub commissioned the 86-page report, which also detailed a 911 system that was overloaded by reports of the shooting on Nov. 7, 2018. For the record: 12:45 PM, Mar. 18, 2021An earlier version of this article said that an off-duty Ventura County sheriff’s deputy and two other off-duty officers who were inside the Borderline bar were armed. Only the deputy was carrying a weapon. The report provides the most detailed account to date of the shooting, the worst in Ventura County history.