The toll in the clashes between supporters and opponents of ousted president Mohamed Morsi in different parts of Egypt rose to 15 early Wednesday, with 114 people injured.
A police officer was killed and 24 people, mostly security personnel, suffered injuries in an overnight blast targeting the security department headquarters in Mansoura city, reported the China Daily citing a security source.
Elsewhere, in Cairo's Nasr City, where pro-Morsi people are staging sit-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, the health ministry said.
On Monday, three people were killed and 44 others injured in Tahrir Square and Qalioubeya's Qalioub city as protestors from both sides exchanged rocks and birdshots.
Egypt has been witnessing a state of division and polarisation since the armed forces ousted president Morsi July 3 in response to millions of people taking to the streets demanding Morsi be overthrown.
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 president.