CAIRO, Feb 4: Police fired tear gas at protesters in the Nile Delta city of Tanta on Monday after the funeral of an Egyptian activist who slipped into a coma and died after several days in custody, witnesses said.

Mohamed al-Guindi, 28, was arrested in Cairo's Tahrir square after joining protests demanding change on the second anniversary of the country's uprising.

The opposition says his death on Monday proves police have not reformed.

The death came as police faced a backlash after riot policemen were filmed beating a dragging a naked man during clashes on Friday outside the presidential palace in Cairo, prompting a minister to resign, according to state media.

The official MENA news agency reported that Culture Minister Mohammed Saber Arab tendered his resignation on Monday over the incident. The state's Al-Ahram newspaper reported on its website that Saber resigned over police abuse.

In Tanta, witnesses said that police fired tear gas on a march that approached the provincial headquarters, following Guindi's burial in the city.

Guindi's lawyers say that after his arrest he was taken to a police camp in Al-Gabal al-Ahmar in Cairo where he was subjected to torture, before being sent several days later to Cairo's Al-Helal hospital.

According to the health ministry, Guindi arrived at the hospital unconscious and suffering from internal bleeding. The Popular Current, to which Guindi belonged, said the activist died “as a result of torture.” Guindi's death and the footage of police beating a protester have confronted Islamist President Mohamed Morsi with uncomfortable parallels with Hosni Mubarak's regime, deposed in 2011 after an uprising partly aimed at police abuses.—AFP