CAIRO - The death toll of continued Egyptian clashes between supporters and opponents of ousted President Mohamed Morsi has risen to 15 and the injured increased to 114 in the early hour of Wednesday.

One police officer was killed and 24 people, mostly security personnel, were injured in an overnight blast targeting the security department headquarters in Mansoura city of Egypt's Daqahliya governorate, a security source told Xinhua.

Elsewhere, in Rabaa al-Adawweya Square in Cairo's Nasr City, where pro-Morsi are sitting-in for over three weeks, two more people were killed in early morning clashes.

Nine people were killed and 33 injured in clashes that erupted early Tuesday between pro-and anti-Morsi Egyptians in the vicinity of Cairo University in Giza governorate, the Health Ministry said.

On Monday, three people were killed and 44 others injured in Tahrir Square and Qalioubeya's Qalioub city as protesters from both sides exchanged rocks and birdshots.

Egypt has been witnessing a state of division and polarization since the armed forces ousted President Morsi on July 3, in response to millions of citizens taking to the streets demandng Morsi's overthrow.

Muslim Brotherhood's group, to which Morsi is affiliated, refused the invitation to take part in the reconciliation meeting, as they insisted on reinstating their legitimate president.