A bomb has exploded in the centre of the Pakistani city of Quetta, capital of the province of Balochistan, killing seven people and wounding 23, officials said.
The blast on Tuesday targeted a police truck close to a high security area where the provincial assembly and other government offices are located.
A man was believed to have walked up to the truck and blown himself up, senior police officer Abdul Razzaq Cheema said.
The bodies of five policemen and two civilians, as well as the wounded victims, were taken to the Civil Hospital.
Dr Waseem Baig told Reuters that death the toll could climb as some of the injured were in serious condition.
The attack took place hours after the provincial chief minister, Sanaullah Zehri, resigned, although there was no indication that the blast was connected to provincial politics.