CAIRO 

The death toll from violence that erupted on the fourth anniversary of Egypt's Jan. 25 uprising on Sunday has risen to 23, according to the Health Ministry.

Sources within ousted President Mohamed Morsi's main support bloc, however, put the total number of fatalities at 25.

"Twenty-three people were killed and 97 injured – 19 of whom were police personnel – across Egypt on Sunday," Heath Ministry spokesman Hossam Abdel-Ghaffar said in a statement.

Sources within the pro-Morsi bloc, for their part, said that 25 people were killed across Egypt on Sunday while 87 others were injured.

A security source who declined to be named had told AA earlier that 429 people had been arrested during clashes that erupted across Egypt on Sunday.

Four years ago Sunday, tens of thousands of Egyptians took to the streets, eventually converging on Tahrir Square in downtown Cairo to protest widespread police brutality.

With many protesters killed and wounded by security forces, the demonstrations eventually became a full-fledged popular uprising to demand the resignation of autocratic President Hosni Mubarak.

Mubarak finally stepped down on Feb. 11 under mounting popular pressure, relinquishing power to the military establishment.

A transitional phase ended with the election of Mohamed Morsi – Egypt's first democratically elected leader – in mid-2012.

Morsi was removed by the military in July of 2013, however, following mass demonstrations against his one-year rule.

His supporters describe his removal as a military coup while others insist it was a "popular military-backed uprising."

Thousands of Morsi's supporters have since been killed or thrown behind bars amid an ongoing crackdown on dissent by the authorities.