Bahir Ahmadi, a spokesman for the provincial governor said the first blast occurred at around 9 a.m. Friday in Patan Khel area in Spin Boldak district of Kandahar.
Ahmadi said that 12 civilians were killed as their vehicle hit a roadside mine in the area.
Meanwhile, a provincial council member said that nine of the victims were members of a family.
The official added that another roadside bomb hit a Mazda at around noon today in the same district.
Ahmadi further said that a person was killed and three more were wounded in the incident.
Immediately no group or individual has claimed responsibility for the attacks.