KARACHI: Two people were killed and a further 10 injured when a bomb exploded on railway tracks in southern Pakistan early Wednesday, police officials said.

The explosion, which caused two of the train's cars to derail, occurred in the town of Thul at around 2:00 am, police official Murtaza Mirani told AFP.

The train, Khushal Khan Khattak Express, carrying passenger from Karachi and was destined for Peshawar.

“Fortunately, the bogies did not overturn as the train was slow, thus averting a bigger catastrophe,” Mirani said.

Ashraf Soomro, a local railway official, said that the injured had been taken to a hospital, while the other passengers were being looked after.

“We are busy repairing the damaged tracks and will send the passengers to Peshawar as soon as possible,” he said.

Mirani said so far no terrorist groups had claimed responsibility for the attack, adding: “We can't comment right now until our investigation is complete.”Thul lies in the Jacobabad district of the southern Sindh province.

Terrorist attacks blamed on militants are less frequent in the south than in the country's restive northwestern border area with Afghanistan.