A bomb explosion on a train in the southern Pakistani city of Hyderabad has killed three people and critically injured about twenty-five others.

Hospital staff say some of the injured have lost limbs, and others have deep wounds.

The blast wrecked a passenger compartment on the train which was just leaving the station on its way to Mirpurkhas.

No one has claimed to have carried out the attack, but the BBC Islamabad correspondent says a senior government adviser Javed Jabbar has accused the Indian intelligence service of being behind the blast.

He said it had been deliberately timed to go off on a day when Pakistanis throughout the country were expressing solidarity with the Islamic militants fighting Indian rule in the divided territory of Kashmir.

From the newsroom of the BBC World Service