**An explosion has rocked a town in central Pakistan, causing a number of casualties, officials say.**The blast happened in Dera Ghazi Khan in Punjab province.
Officials say the target was senior provincial government adviser Zulfiqar Khosa, although he was unhurt. Several shops were destroyed, witnesses said.
Pakistan has been hit by a string of attacks by militants in recent months, which have left hundreds of people dead and injured.
It comes amid a continuing army offensive against the Taliban’s stronghold in the north-west.