U.S Chemical Safety Board (CSB) exposed its initial investigation over the fire explosion on last October 23, 2009, at Puerto Rico fuel storage depot, which is owned by Caribbean Petroleum Corp in Bayamon, San Juan.

According to CSB, the accident was caused by malfunctioning of fuel level monitoring system that made the gasoline tank overfilled. No employees were aware about the tank overfilling since the computerized level monitoring system was not fully operational, as reported by Reuters. (more…)