At least six persons were killed and 15 more injured when a bomb went off in a crowded market in the Orakzai tribal region of north-west Pakistan on Thursday.

The bomb, hidden in a donkey cart, exploded in Hasanzai Bazar of Orakzai Agency this morning.

State-run Radio Pakistan reported that six persons were killed and 15 more wounded.

No group claimed responsibility for the attack.

Orakzai Agency is one of the seven semi-autonomous tribal districts of northwest Pakistan.

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