An Egyptian court has upheld death sentences for 11 men over their involvement in deadly football stadium violence in 2012 in Port Said.

The violence followed a match between the al-Ahly and al-Masry clubs in February of that year, and left up to 72 football fans dead.

The riots - Egypt's worst-ever football disaster - began after a top-league game at Port Said stadium.

The violence sparked unrest in the capital, Cairo, where another 16 died.