AGRA?Three people died and around a dozen were injured when two express trains collided in thick fog in India's northern state of Uttar Pradesh Saturday, a senior railway official said.

The accident happened near Tundla, 25 kilometers (16 miles) from the Taj Mahal town of Agra, when the driver of one of the trains apparently did not react to a signal, slamming his train into another on the same track.

"According to preliminary information, there are three deaths," Devesh Mishra, divisional railway manager at Agra told AFP.

Television footage showed two carriages of the Shram Shakti Express, travelling from New Delhi to the industrial hub of Kanpur, badly mangled after the collision.

Saturday's accident comes a fortnight after ten people were killed in similar train accidents in Uttar Pradesh.

Dense fog in northern India over the past two weeks has caused chaos on the transport network, with delays or cancellations of trains and flights commonplace.