At least eight people, including two policemen, have died in violence that erupted following the death sentence verdicts handed down to 21 people for their role in a deadly football riot in February, 2012.
Supporters of the defendants attempted to storm the prison to free defendants and two police were shot dead. Police fired tear gas and rubber bullets at the crowd, killing six people.
Officials say the Egyptian military has moved into the city. General Ahmed Wasfi said:
"It has been decided to deploy some units to work for calm and stability and the protection of public establishment"