Islamist President Mohamed Morsi warned that political divisions in Egypt "threaten to paralyse" the country, as at least one person was killed and scores were hurt in clashes between his supporters and opponents.
In a televised speech yesterday to mark his turbulent first year in power, Morsi promised reforms and called for national dialogue, as tensions mounted ahead of mass rallies planned against him on June 30.
"Egypt faces many challenges. The polarisation has reached a stage that could threaten our democratic experience and paralyse the nation and cause chaos," Morsi said.
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At least one person was killed and 237 were hurt, the health ministry said.
Two of the injured were taken to the intensive care unit of Mansura International Hospital with live bullet wounds, medics there said.
The clashes came amid widespread anxiety ahead of planned anti-Morsi rallies on Sunday.
Organisers of a campaign dubbed Tamarod (rebellion in Arabic) say they have collected more than 15 million signatures in support of a snap presidential election.
And with Islamist parties having called for their own rallies to support the president tomorrow, there are fears of more violence.
Gatherings for and against the president were being held around the country today, but confrontations only erupted in Mansura, a security official said.
In Cairo's Tahrir Square, the epicentre of the 2011 revolt that toppled president Hosni Mubarak, hundreds of anti-Morsi protesters gathered to watch the president's speech.
Some have announced they will begin a sit-in there.
Others gathered outside the defence ministry, waving Egyptian flags and chanting against the president.
In Alexandria and several Nile Delta provinces, Islamist groups have held rallies to support of him.
Morsi promised reforms and called for dialogue in a bid to placate protesters ahead of Sunday's rallies.
He insisted he was working for the goals of the revolution that toppled Hosni Mubarak in 2011, which he is accused of failing.
"For the revolution to reach its goals, there must be reforms at the root," he said.
Morsi repeated his call for dialogue with the opposition, amid deep tension and anxiety ahead of the Sunday protests to call on him to step down.
"We Egyptians are able to overcome this phase and overcome the challenges... All I ask of you now is to sit and discuss... To look for the positives and build on them; and to fix the negatives."
The president admitted to making mistakes and vowed to correct them.
"I have made many mistakes, there is no question. Mistakes can happen, but they need to be corrected," he told a packed auditorium.
But he warned the media against misusing the freedoms the revolution granted them.
"One year is enough!," he said in reference to the repeated criticism against him.