Sources said the two brothers were riding on their motorbike and ran over a planted landmine in the Nasau area, The Express Tribune reported.
The injured was taken to the hospital for medical assistance and the body of the deceased was transported by the rescue team.
Earlier also, several deaths have been reported due to accidental landmine blasts in the district.
The police had to file a case against unidentified persons and an investigation is underway after a protest by the residents of the area.
Earlier, six security personnel were killed and three others injured in a blast in Balochistan's Harnai district.
The Frontier Corps (FC) personnel were patrolling the area when their vehicle was targetted with an Improvised Explosive Device (IED).
(This story has not been edited by Business Standard staff and is auto-generated from a syndicated feed.)