Egypt's prosecutor-general Nabil Sadek ordered on Thursday an investigation into clashes that erupted on Tuesday between security forces and spectators at Cairo Stadium during the football match between Ahly and Gabon's CF Mounana in Cairo.

The prosecutor-general ordered the High State Security Prosecution to investigate the clashes, which broke out near the end of the African Champions League game.

The prosecution said in a statement that the clashes were a matter of “national security,” though he stressed that the incident was in no way connected to Ahly club.

Some in the media have blamed the incident on hardcore football fan club Ultras Ahlawy, who said in a statement on Facebook that an “irresponsible minority" was responsible for the clashes.

The group added that it did not want the issue to be “used in a political way.”

Ali Darwish, the head of the Cairo Stadium Authority, said in media statement on Thursday that the clashes have caused EGP 650,000 in property damage to the stadium.

Football fans have been banned from domestic league games in Egypt since February 2012, when over 70 Ahly supporters died in clashes between fans at Port Said Stadium.

The crowd ban was briefly lifted in January 2015, but swiftly re-imposed after 20 Zamalek fans died in a stampede when police used tear gas to disperse crowds lined up to attend a regular league game against Enppi.

In the past five years, authorities have permitted a limited number of fans to attend African games and national team matches, as per FIFA rules.