Another Pakistan bombing

At least 20 people have been killed in a bomb attack in a market in central Pakistan.



Officials say about 50 others were wounded in the blast in Dera Ghazi Khan, which badly damaged a number of buildings.



They say the target may have been a provincial official, who was unhurt.



Pakistan has recently been hit by a string of attacks that have left hundreds of people dead or injured.



An emergency has been declared at all local hospitals.