Mursi, in a decree last night, announced that the vote will take place in four stages due to a shortage of election supervisors. The new parliament will convene on July 6.
The election process will take place in four stages, April 27-28, May 15-16 and June 2-3 and 19-20, according to the official decree released by the president's spokesman, Yassir Ali. Runoffs will be held one week after each stage.
ElBaradei wrote on his Twitter account that Mursi's "decision to go for parliamentary elections amidst severe societal polarisation and eroding state authority is a recipe for disaster."
The opposition accuses Mursi and the Muslim Brotherhood of monopolising power and going back on campaign promises to set up an inclusive government and introduce far-reaching reforms.
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In the past year, violent clashes in the coastal province along the Suez Canal have highlighted the longstanding resentment residents there feel towards Cairo. Both Port Said and Cairo are included in the first round of voting.
The Islamist-dominated parliament was dissolved last June after judges ruled election laws were unconstitutional.