evidence: Odisha train accident: CBI probe may look at error in interlocking system, sabotage CBI will look at all possible reasons behind the horrific three-train crash in Odisha’s Balasore district last week, officials said. The Central Bureau of Investigation (CBI) will look at all possible reasons behind the horrific three-train crash in Odisha’s Balasore district last week, including human error and sabotage, a senior officer said on Monday, as railway authorities expanded their probe and questioned the assistant station master and drivers of the two trains to ascertain how the worst rail accident in nearly three decades occurred.