In an apparent revenge attack, a Taliban fighter from Mullah Rasoul's group detonated his explosives among a group of fighters from rival Taliban group led by Mullah Haibatullah, killing at least four.
According to a provincial government spokesman, a suicide bomber from Mullah Rasoul's break away faction detonated explosives while among a group of fighters from Mullah Haibatullah's group.
At least five Taliban fighters were killed and four wounded in the initial suicide car bombing that took place early Wednesday in Gereshk - this was against Mullah Rasoul's men.
In the revenge attack, four were killed and two were wounded.
A source from Mullah Rasoul's group confirmed the first incident but would not provide details.
The breakaway Taliban faction appointed its own leader following the death of founder Mullah Omar and the subsequent appointment of Mullah Akhtar Mansour.
At the time, Mullah Rasoul says he and his supporters tried hard to convince Mullah Mansour to step down and let the new leader be appointed by consensus - but they say he refused.
Mullah Rasoul is believed to have a few hundred loyal fighters who are mostly found in the south and south-eastern parts of the country.