Egyptian President Mohamed Mursi has declared a month-long state of emergency in three cities, along the Suez Canal where dozens of people have been killed over the past four days in protests, which his allies describe as a means to overthrow him.

Seven people were yesterday shot dead and hundreds were injured in Port.

A total of 49 people have been killed since Thursday and Mursi’s opponents, who accuse his Islamist Muslim Brotherhood of betraying the revolution that ousted long-time ruler Hosni Mubarak, have called for more demonstrations on Monday.

“Down, down Mursi, down down the regime that killed and tortured us!” people in Port Said, chanted as the coffins of those killed on Saturday were carried through the streets.

Mursi, who was elected in June, is trying to fix a beleaguered economy and cool tempers before a parliamentary poll in the next few months which is supposed to cement Egypt’s transition to democracy. Repeated eruptions of violence have weighed heavily on the Egyptian pound.

In a televised address, he said a nightly curfew would be introduced in Port Said, Ismailia and Suez, starting from Monday.

Several hundred people protested in Ismailia, Suez and Port Said after the announcement, in which Mursi also called for a dialogue with top politicians. Activists in the three cities vowed to defy the curfew in protest at the decision.

“The protection of the Nation is the responsibility of everyone. We will confront any threat to its security with force and firmness within the remit of the law,” he said, offering condolences to families of the victims.