While it is unclear exactly how the clash started, police from the two sides published separate official statements online, which were quickly deleted, it said.
The incident underlines the problems China faces as it seeks a return to normalcy after months of lockdown, the Post said.
After the incident, the governments of Huangmei and Jiujiang on Friday issued a joint statement saying they had agreed to remove the barriers set up to restrict travel during the lockdown, and also to recognise each other's health screening codes to make it easier for people in good health to get to where they needed to be, the Post report said.