"At the time, a “unknown substance” of “pressurized vapor” was emitting from the 10,000-gallon tank and a Hazardous Materials response team was called, the fire department said.

"The driver of the flatbed truck, who was not injured in the incident, did not know what was inside the tank, the fire department said."

I think there might be some problems here

luckily the tank only had residual liquid oxygen that had been used to clean it