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A 13-year-old boy has been shot dead in unrest in Port Said after the Egyptian city's football team was suspended, state media report.

After overnight violence, new clashes erupted on Saturday between fans of the al-Masry club and security forces.

Al-Masry, one of Egypt's top teams, has been banned for two years over violence at its stadium in February in which at least 74 people died.

A criminal investigation into that incident is continuing.

The suspension of al-Masry means the team will not compete in competition until the end of 2013.

Hundreds of angry al-Masry fans took to the streets of Port Said on Friday evening to protest against the ruling, besieging a government building. Troops fired into the air to try to disperse the crowds.

The official al-Ahram newspaper said a 13-year-old boy died in hospital after being shot in the back and that dozens of people were injured as the army tried to prevent protesters from reaching the Suez Canal.

Reuters news agency quoted a medical source as saying that two more people were being treated for gunshot wounds.

Clashes broke out again on Saturday as protesters hurled stones at the security forces. In return, they lobbed tear gas and fired bullets into the air, witnesses said.

Demonstrators gathered outside the administrative headquarters of the Suez Canal. The harbour was closed and protesters blocked roads into the city, Reuters reported, meaning many factories could not open as their workers could not get in.

Officials told the news agency that shipping using the Suez Canal was being diverted onto a secondary route.

February's violence erupted at al-Masry's stadium following a game against Cairo team, al-Ahly.

Al-Ahly have been ordered to play four games behind closed doors. The club's coach and captain have been suspended and fined.

Supporters of the Cairo club have denounced the punishment on al-Masry as weak, saying they would hold a sit-in at the team's grounds on Sunday.

The two teams are long-standing rivals whose games have required a large security presence.

Al-Masry won February's home game 3-1, but as the game ended, their fans invaded the pitch, attacking al-Ahly players and fans.

Rumours that the police had failed to intervene sparked days of clashes across the country in which a further 16 people died.

There were also claims that fans had been allowed to take knives and other weapons into the stadium.

In the days after the riot, large protests blaming the military government for the deaths were held outside the interior ministry in the capital, Cairo.

Last week, Egypt's chief prosecutor charged 75 people with murder or negligence over the 1 February violence.

Nine police officers were reportedly among those facing charges.

The ´óÏó´«Ã½'s Jon Leyne in Cairo says Egyptian football fans are notoriously violent, particularly a section of al-Ahly supporters known as the Ultras.

They were heavily involved in confronting the police during last year's political protests.

Many of al-Masry's fans believe the government wants to take revenge on them for their role in last year's revolution against President Hosni Mubarak.

The football league season was cancelled in the wake of the unrest and has not yet restarted.