Egypt's top court upheld death sentences for 10 men on Tuesday for their part in Egypt's worst violence at a football stadium, in which more than 70 fans were killed in February 2012.

Many of the dead were crushed when panicked fans tried to escape from the Port Said stadium after a post-match pitch invasion by supporters of the local side Al-Masry. Others fell or were thrown from terraces, witnesses said at the time.

The ruling by the Court of Cassation, which is final, excluded an 11th defendant who remains at large after his death penalty was also confirmed in June 2015 by another court.

READ MORE: Interview - Bob Bradley on Port Said deaths

Football matches are often a flashpoint for violence in Egypt. The teams in the Port Said incident - Al-Masry and Cairo's Al-Ahly - are longtime rivals. Witnesses said the rioting broke out after Cairo fans unfurled banners insulting the local team, which had won the match 3-1.

Since then Egypt has curbed the number of people allowed to attend matches and supporters have often tried to storm stadiums they are banned from entering.

In February 2015, at least 22 people were killed outside a stadium when security forces barred fans from entering.

Most of the casualties suffocated when the crowd stampeded after police used tear gas to clear the fans trying to force their way into a league match between two Cairo clubs, Zamalek and Enppi, doctors and witnesses said.

Fan clubs known as "Ultras" were outlawed in May 2015. Relations between the Ultras and security forces have been tense for four years after the fans played a key role in the 18 days of street protests that toppled autocrat Hosni Mubarak.