This comes after a video that appeared to show a gang questioning and assaulting individuals holding an opposition meeting was widely shared on social media.
The incident has increased worries that some of the violence that has marred previous Zimbabwean elections will reoccur during this year’s election.
The video purports to have been shot in Murehwa, northeast of Harare, and shows a woman questioning a group of people while criticising them for siding with the opposition.
After that, men beat an elderly man repeatedly with wooden poles while holding him down on the ground.
The punishment is carried out in front of a young child.
The opposition Citizens Coalition For Change says this is one of many pieces of evidence that show the governing Zanu-PF party has unleashed vigilante groups ahead of elections.
A Zanu-PF official in the area has distanced his party from the attack.
Rights groups have often accused the governing party of using systematic violence as a tool to win elections.