**A bomb has exploded at a sports field in the troubled north-west region of Pakistan, where a volleyball game was under way.**Police say they fear there will be casualties from the blast in the city of Lakki Marwat, close to the tribal areas of north and south Waziristan.
A police official told Reuters news agency it was a suicide attack.
“The bomber was on foot and he blew himself up during the game,” the official, Habibullah Khan, said.
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