Football clash kills leaves dozens dead in Egypt (Video).

At least 74 people have been killed in clashes between rival fans following a football match in the Egyptian city of Port Said, BBC News reported.

Scores were injured as fans - reportedly armed with knives - invaded the pitch after a match between top-tier clubs al-Masry and al-Ahly.

Officials feared the death toll could rise further.

It is said to be the biggest disaster in the country's football history, said the Egyptian deputy health minister.

"This is unfortunate and deeply saddening," Hesham Sheiha told state television.

Some of the dead were security officers, the Associated Press news agency quoted a morgue official as saying.

Field Marshal Hussein Tantawi, the head of Egypt's ruling army council, went to a airbase near Cairo to welcome back al-Ahly players who were flown back from Port Said on a military aircraft.

"This will not bring Egypt down... These incidents happen anywhere in the world. We will not let those behind it go," he said, AP reports.

A statement posted on the Supreme Council of the Armed Forces' Facebook page announced three days of national mourning, beginning on Thursday.

The statement also promised a full investigation into the incident.