Sixteen civilians have been injured. Six intelligence personnel have been injured, two border police have been injured," Abdul Razaq, a senior border police official, told AFP.

"The bomber was being chased by the intelligence department. He detonated in the middle of the town. The casualties may rise," he added. The attack is the latest in a string of suicide blasts to hit Afghanistan in the last three weeks more than 100 people including many bystanders have died in six big blasts.