Investigators were on Saturday looking into any human error, signal failure and other possible causes behind the three-train crash in Odisha's Balasore district as officials submitted a preliminary inquiry report into the worst rail accident in India in nearly three decades that left at least 288 people dead and over 1,100 injured.Prime Minister Narendra Modi visited the accident site and was briefed by Railway Minister Ashwini Vaishnaw as well as officers of the disaster management teams. He also met some of the injured in the hospital."I do not have words to express my pain... No one would be spared and strong action would be taken against those found guilty. Instructions have been given to ensure the proper and speedy investigation into the tragedy," Modi said, adding that more focus will be given to the security of rail passengers.

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