Three railway employees have been arrested in connection with India's deadliest train crash in two decades that killed 292 people last month.
The arrests were made under Indian penal code sections related to culpable homicide and causing evidence to disappear, according to the statement from The Central Bureau of Investigation (CBI).
Of the three people arrested, two are engineers and one worked as a technician for the railways.
The June 2 crash at Bahanaga Bazar station, in the eastern Indian state of Odisha, also injured more than 1,000 people.
The accident happened when a passenger train hit a stationary freight train, jumped off the tracks and hit another passenger train coming from the opposite direction.
The CBI had launched an investigation after registering a case of criminal negligence. The investigation into the case was continuing, the CBI said.
According to Reuters, the Commission of Railway Safety (CRS) investigators said the first collision occurred due to modifications made to the signalling circuit to fix frequent problems at a nearby rail-road barrier.
Local railway staff did not have a standard circuit diagram which led to a faulty connection in the signalling system when they tried to take the boom-barrier circuit offline for repair.
The malfunctioning system directed the passenger train onto the path of the freight train, it said.
Indian Railways, the fourth largest train network in the world, is a state monopoly run by the Railway Board. The board reports to the Railways Ministry.