Rukutana was arrested on Saturday, alongside his three bodyguards and his driver, on charges of attempted murder and malicious damage.
Top Criminal Investigations Directorate (CID) officers, led by director Grace Akullo are in Mbarara, to investigate a shooting incident linked to state minister for labour Mwesigwa Rukutana.
The CID boss is also expected to investigate the election-related violence that was reported in Isingiro district, in which two people were shot dead on Friday.
Rukutana was arrested on Saturday, alongside his three bodyguards; Police Constable (PC) Pual Agec, PC Faizo Kazoola, L/Cpl John Bosco Okello and his driver, Napoleon Nuwamanya, on charges of attempted murder and malicious damage.
The arrests follow Saturday morning skirmishes involving Rukutana and Dan Rweiburingi, the former Rushenyi County aspirant on the Forum for Democratic Change ticket, a key supporter of Naomi Kabasharira, Rukutana's opponent in the National Resistance Movement primaries.
Rwizi region Police spokesperson Samson Kasasira said Rukutana and four others had been transferred to the Rwizi region Police and were being detained at Mbarara Police Station.
"Rukutana and his three bodyguards and driver are in detention. The guns have been exhibited and will be taken for forensic testing, to find out whether any of them discharged bullets," Kasasira said.
He would not say if Rweiburingi had suffered gunshot wounds as reported. He said Rweiburingi was out of danger.
"For now, we have not recorded any victim's statement," he said.