According to reports, some supporters clashed with the police before Equatorial Guinea's second game against Burkina Faso on Wednesday.
The reports states that fans reportedly threw stones and bottles outside the stadium in Bata - a violent act which compelled the police to respond by firing smoke grenades.
The violence occurred as many supporters were trying to enter the ground through a single entrance before the match.
It is also reported that a great number of supporters did not have tickets for the game, which ended 0-0.