India's railway minister has suggested a signal fault led to the Odisha rail disaster, with a "change in electronic interlocking" the likely cause.

Ashwini Vaishnaw later said the cause and people responsible for the deadly three-train crash in eastern India had been identified but did not elaborate.

India's Railway Board said there had been "some kind of signalling interference" rather than failure.

A report into India's worst rail accident this century is due later.

Meanwhile the death toll has been revised down to 275 after some bodies were counted twice, officials said.

Of the 1,175 injured people taken to hospital, 793 have been discharged. Some families are still searching for their loved ones.

In railway signalling the electronic interlocking system sets routes for each train in a set area, ensuring the safe movement of trains along the track.

The crash saw a passenger train collide with a stationary goods train and derail, after being wrongly directed onto a loop track by the side of the main line. Derailed carriages then struck the rear carriages of a second passenger train passing in the opposite direction.

At a press conference on Sunday, Jaya Verma Sinha from India's Railway Board said both passenger trains had approached a Balasore district station under a green signal - indicating it was safe - within seconds of each other at the correct speed of under 130kph (81mph).

She said the passenger trains had been supposed to pass each other on the main lines but the Coromandel Express rammed into an iron ore-laden freight train on the loop line, causing the engine and some coaches to lift over the top of the heavy goods carriages.

The passenger train took the entire impact on collision and the freight train was not derailed, or even moved, she told reporters.

The Howrah Superfast Express had nearly crossed in the opposite direction, but two of its rear coaches were struck by the derailed Coromandel Express.

Ms Verma Sinha said there was "no issue with the electronic interlocking system" and said investigations indicated "some kind of a signalling interference" rather than failure.

"Whether it was manual, whether it was incidental, whether it was weather related, whether it was because of wear and tear related, whether it was a maintenance failure, all that will come out after the inquiry," she added.

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