A suicide bomber on a motorbike detonated the explosives in a town called Farah. The blast reportedly took place near the governor's residence at a spot where heavy trucks were being loaded up with goods preparing to leave to neighbouring Herat.
"A suicide bomber with a motorcycle carried out a suicide attack in the centre of Farah town in the area of Ada Herat," Faqir Ahmad Askar, police chief of the southwestern province of Farah is quoted as sating in news reports.
"Twelve people, of which 11 were civilians, and one police officer were killed," provincial governor Rohul Amin Amin told a news agency.
He added that over 37 people were injured in the attack, most of whom are civilians. About a dozen of the injured people in critical condition and the death toll may rise, the governor added.
This comes just a day after the Hamid Karzai was sworn in as the President for the second term. Karzai promised the people that he would try to bring peace to the nation and take over security from foreign forces in five years.