According to eyewitnesses, members of the Zimbabwe National Army attacked police officers with whips and sticks in the Harare central business district.
The clash is said to have started at the Fourth Street commuter bus station in downtown Harare, which is usually teeming with people waiting for transport to go home after work.
The police have not commented about the incident, but some of the eyewitnesses said the attack was believed to have been a retaliatory move after the traffic police allegedly threw spikes on an army vehicle on Monday.
The police have often come under fire for throwing spikes at vehicles and endangering lives of motorists and passengers.
A number of people have died after spikes were thrown at vehicles they were travelling in and the responsible police officers usually disappear from the scene after this happens.
The clash comes as political tension is reaching boiling point in Zimbabwe following last week’s warning by President Robert Mugabe for the army top brass to stay clear of politics.
Army generals are allegedly backing Vice President Emmerson Mnangagwa to succeed Mugabe as president of ZANU PF and the country.