At least 73 people have been killed in clashes after a football game in the Egyptian city of Port Said, medics say.

About 1,000 others were injured in Wednesday's violence, including police. At least two players suffered light injuries.

Fans of the winning al-Masry team flooded the field seconds after the match with al-Ahly, Egypt's top team, was over.

A security official said the fans chased the players and cornered their supporters on the field and around the stadium, throwing stones and bottles at them.

Thousands of supporters covered the field, as seen in a video posted online.

"This is unfortunate and deeply saddening. It is the biggest disaster in Egypt's soccer history," Hesham Sheiha, deputy health minister, said.

He said most of the injuries were caused by concussion and deep cuts.

Al-Ahly football players were trapped in the changing room along with supporters. Riot police were sent in to drive the rival crowds of fans back.