Heavy casualties are feared after a passenger train was derailed by an explosion then hit by another train as it travelled through a rebel stronghold of eastern India, according to Indian media reports.
The Press Trust of India news agency reports 13 passenger coaches on a Mumbai-bound train derailed after an explosion early on Friday.
Those coaches were then hit by a cargo train coming from the other direction.
The passenger train, which had left Calcutta, was passing through an area that has faced repeated attacks by India's Maoist rebels.
Rail officials told the agency that "heavy casualties" were feared.