On Tuesday The Central Bureau of Investigation (CBI) team reached at the accident site and took over the investigation into the horrific 3-train crash which occurred on Friday in Odisha’s Balasore where 278 people were found dead.

​The CBI filed a case with several sections of the Indian Penal Code. The police of Odisha has filed a case with charges of “causing death by negligence and endangering life” in the train accident.

The interference of the CBI is a notable move as officials say only a detailed investigation by a top agency can state criminal tampering, if any, with the point machine or the electronic interlocking system, or can state if the train have been changed tracks due to some technical issues or a signaling error.

Railway officials had earlier mentioned that it is possible of the interlocking system being “sabotage” or tampered, which detects the presence of trains, leading to the accident involving the Shalimar-Chennai Central Coromandel Express, the Bengaluru-Howrah Superfast Express, and a goods train.

The accident involved two passenger trains and a goods train, which resulted 278 people dead and more than 800 injured. According to the initial investigation, the mishap was the result of a signalling problem and there was no caused collision, as per the railway department.

As asked by some railway experts, whether Coromandel Express may got hit by the goods train directly inside a “loop line”. Visuals show that the Coromandel Express’ engine was on the top of the goods train, hence a direct collision.

The CBI investigation will be focused on getting answers about all queries regarding the accident, the worst in India in the last two decades. Government officials have assured that all angles will be investigated, including mechanical error, human error, and sabotage. On Saturday, PM Modi said that no one will be shown mercy for those who are found guilty.