Three people were killed and more than 30 injured in Egypt on Wednesday, according to a senior health official, in the latest acts of violence since the army deposed elected Islamist president Mohammed Morsy.

Two people were killed and three were injured when unidentified people attacked a pro-Morsy march in Cairo, said Mohammed Sultan, the head of the government ambulance service.

According to Gehad El-Haddad, a spokesman for Mr. Morsy’s Muslim Brotherhood, police in plain clothes attacked the demonstrators using live ammunition.

Elsewhere, one policeman died and 28 other people were wounded, when two bomb blasts hit a security building in the Nile Delta town of Mansura, Mr. Sultan told the independent newspaper al-Youm al-Saba.

The bombing came days after three women were killed in an attack on a pro-Morsy rally in Mansura, which the Brotherhood blamed on "thugs" protected by the police.

"Our revolution is peaceful and its activities are wholly peaceful", said Mohammed Badie, the Brotherhood head, disassociating his group from involvement in Wednesday’s bomb attack.

"Our cause against the coup is fair, and we demand the return of legitimacy", the Brotherhood website quoted Mr. Badie as saying.

The army ousted Mr. Morsy on July 3 after millions of Egyptians took to the streets demanding his resignation and an early presidential election.

The Brotherhood has condemned Mr. Morsy’s toppling as a coup and vowed to protest until he is restored to office.

Dozens have been killed in Egypt since Mr. Morsy’s overthrow.

The Brotherhood is to boycott reconciliation talks proposed by interim President Adli Mansour, a spokesman for the Islamist group, Ahmed Aref, said, according to state-run newspaper al-Ahram.

Groups allied to the Brotherhood are also shunning the talks because they do not recognize the current military-backed government, he said.

Mr. Mansour, a top judge, called this week for national reconciliation to heal rifts in the politically polarized country.

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