Railway officials in northern India say an explosion on a long-distance passenger train has killed at least seven people and injured more than 50 others.
The officials say the blast occurred Thursday afternoon near the town of Jaunpur in Uttar Pradesh state. They say the death toll is likely to rise as the condition of many of those injured in the blast was serious.
The train was traveling from the eastern city of Patna to New Delhi at the time of the explosion.
Medical teams have been rushed to the scene and train passengers have been evacuated.
Railways Minister Laloo Prasad Yadav said it was unclear whether the explosion was caused by a bomb or by a gas cylinder. An investigation is under way.