Gunshots were fired at the Amaimo Registration Centre in Ikeduru local government area of Imo State on Saturday.
Security operatives reportedly fired the gunshots into the air to address an argument that erupted among party supporters.
The gunshots were fired a few meters away from the Central Amaimo school the polling unit of the PDP governorship candidate, Samuel Anyanwu.
The incident happened at about 9.48am with a few voters already checking their names on the displayed INEC register.
