The blast went off in a closed shop in Faqir Killey market on the outskirts of Peshawar this afternoon.
Two children and a woman were among the injured.The condition of two of the wounded was described by officials as serious.
Several of the injured persons were taken to Lady Reading Hospital.
The nature of the blast could not immediately be ascertained.
Published 26 October 2011, 13:24 IST