NEW DELHI (REUTERS) - At least 25 people were injured on Thursday (March 30) when eight carriages of a passenger train derailed in northern India, a railway ministry spokesman said, the latest in a series of incidents involving the world's fourth-largest rail network.

The Mahakoshal Express was travelling from Jabalpur city in central India's Madhya Pradesh to the capital, New Delhi, when it derailed early in the morning in Uttar Pradesh state.

"Rescue operations are underway. We have rushed a disaster management team to the incident spot," railways ministry spokesman Anil Saxena said in New Delhi.

The cause of the derailment has not been determined yet and police would investigate whether it was an accident or a planned attack, he said.

India's state railways, built during British colonial rule, have an appalling safety record after decades of underinvestment and a priority on keeping fares low for the 23 million passengers who use the network every day.

In the previous serious accident, 150 people were killed when a train derailed in Uttar Pradesh late last year.

India recorded 27,581 railway deaths in 2014, the most recent year for which figures are available, with most victims falling from, or being struck by, moving trains.