CAIRO: At least 49 people have been killed in 24 hours of clashes that erupted Saturday during rival rallies marking the anniversary of Egypt's 2011 revolt, the health ministry said.

In addition, 247 people were injured, the ministry said in a statement on Sunday.

The interior ministry said for its part that 1,079 people had been arrested during the demonstrations that came three years after the start of the uprising that forced long-serving autocrat Hosni Mubarak to quit.

The clashes broke out between protesters who support deposed Islamist president Mohamed Morsi and those backing the military, which ousted him in July after a single turbulent year in power.

Security forces have since waged a bloody crackdown in which at least 1,000 people have been killed and thousands of Islamists arrested, including virtually all top leaders of Morsi's Muslim Brotherhood movement.