The blast took place near a shopping centre in the area.
The bomb blast smashed windows of nearby shops and plazas and also damaged vehicles parked nearby.
According to Quetta Capital City Police Officer Razzak Cheema, the bomb was planted in a motorcycle parked in the area.
The injured were rushed to Civil Hospital Quetta where emergency was imposed to provide urgent treatment to those injured in the explosion.
The area has been surrounded by FC personnel and police.
Chief Minister Balochistan Dr Abdul Malik Baloch has taken notice of the blast and called for a report.
Bacha Khan Chowk is a business center located in the heart of Balochistan’s capital city. The area was at its busiest when the blast occurred.
Shopping centers and shops in the area were closed and traffic suspended after the blast.
There was no immediate claim of responsibility for the attack. NNI