All true! But my gut says otherwise. We will probably never know for sure.
My gut says no way in the world a fire burns at a tank farm for half an hour and no one reports it. Smoke is going to get immediate attention. The temperature sensors at the tank probably already had the alarms going off before there was even smoke.
edit:
I believe we will know what happened, but it will likely take about 2 years for the Chemical Safety Board to release their full report. For example:
Loss of Containment, Fires, and Explosions at
Enterprise Products Midstream Gas Plant
Pascagoula, Mississippi | Incident Date: June 27, 2016 | No. 2016-02-I-MS
https://www.csb.gov/assets/1/6/final_case_study_-_enterprise.pdfPublished: February 13, 2019