Supporters of former Terego county member of parliament Mr Kassiano Wadri, an independent candidate in the Arua by-election, have smashed the windscreens of the car belonging to the mayor of Arua municipality, Mr Issa Kato.
The angry voters accused Mr Kato of carrying pre-ticked ballot papers.
The incidence took place at Enyau Kebiri cell, where the mayor and his team had reportedly travelled to monitor the voting process.
A scuffle ensued in which one person was injured. The windscreens of the car used by Kato and his group was also vandalised, forcing him to abandon the venue.
While the youths also accused Kato of knocking one person, supporters of Nusura Tiperu said the person fell off the car after he attempted to jump on to grab one of the occupants.
In related story; Residents stormed NRM team in an hotel as voting in Arua is underway.