Opponents and supporters of Egypt's President Mohammed Morsi clash in the northern city of Alexandria as thousands take part in rival ...
Clashes break out at protests in northern Egypt
Protesters stormed the Alexandria office of the Muslim Brotherhood
Supporters and opponents of Egyptian President Mohammed Morsi have staged rival rallies across the country but there has been violence in the north.
Tension has risen ahead of a Sunday protest planned by the opposition.
Thousands of Morsi supporters rallied outside the main mosque in Cairo's Nasr district.
At least one person, said by state TV to be a US journalist, was killed in Alexandria as protesters stormed a local Muslim Brotherhood office.
There are conflicting reports about how the young man, who was said to be taking photos of the demonstration, died.
Egyptian officials say he was stabbed in the chest, but other reports say he was hit by gun pellets.
The US state department said it was investigating the reports of his death.
Dozens more people were injured when anti-Morsi protesters and Islamists clashed in the northern city, the second biggest in Egypt.
The office of the Muslim Brotherhood, which backs Mr Morsi, was set on fire, and the authorities are reported to have called in riot police and army helicopters to try to quell the violence.
A Muslim Brotherhood-funded TV channel said petrol bombs were thrown in another northern area, Sharqia.
At least five people are now reported to have died in northern Egypt in violence linked to the political situation in the past few days.
Security is tight in many areas with troops deployed in Cairo and elsewhere.
Egypt's leading Muslim authority, the Al-Azhar institute, has issued a statement warning against escalating violence.
"We must be alert lest we slide into a civil war that does not differentiate between supporters and opponents," it said.
Mr Morsi's supporters are holding "open-ended" rallies before what the opposition bills as big protests on Sunday calling for him to resign. Sunday is the first anniversary of the president's inauguration.
Thousands of supporters of the Muslim Brotherhood and its Islamist allies massed outside Nasr City's Rabaa al-Adawiya mosque on Friday.
They stressed what they see as Mr Morsi's "legitimacy", rejecting the opposition's demand for him to resign.
Morsi opponents gathered in Tahrir Square, ahead of Sunday's planned march to the presidential palace, and anti-Morsi protesters began a sit-in outside the building.
Police officers and former military personnel also assembled outside the ministry of defence in Cairo in opposition to Mr Morsi's rule and called for the military to take power again.
The main opposition coalition on Thursday rejected President Morsi's offer of dialogue.
In a statement, the National Salvation Front said it "remained determined to call for an early presidential election".
"We are confident the Egyptian people will come out in their millions to hold peaceful demonstrations on all of Egypt's squares and streets to realise their aspirations and to put the 25 January revolution back on track," it added.
The opposition was referring to the popular uprising in January 2011 which ousted President Hosni Mubarak.
Morsi speech
Mr Morsi said divisions threatened to "paralyse" Egypt, in a speech on Wednesday to mark a year in office.
Mr Morsi, who hails from the Muslim Brotherhood, became Egypt's first Islamist president on 30 June 2012, after winning an election considered free and fair.
His first year as president has been marred by constant political unrest and a sinking economy.
The president also used his televised address to warn the media not to abuse free speech.
Within hours ripples from the speech could be felt across Egyptian media.
A talk show on the al-Fareen TV channel ended abruptly on Thursday night when the presenter learned he was to be arrested. Host and owner Tawfiq Okasha is accused of spreading false information, and the channel has ceased broadcasting.
Another prominent presenter resigned on air on state-run television in protest at what he called government interference in the editorial content of his programme.
In his speech, President Morsi defended his performance, admitting errors and promising immediate and radical reforms to address them.
"I was right in some cases, and wrong in other cases," he said. "I have discovered after a year in charge that for the revolution to achieve its goals, it needs radical measures."
He apologised for the fuel shortages that have caused long lines at petrol stations and angered many Egyptians, and also for failing to involve the nation's youth enough.
But despite Mr Morsi's initial conciliatory tone, the speech swiftly moved into a condemnation of those he blamed for Egypt's problems, the BBC's Aleem Maqbool in Cairo reports.
"I took responsibility for a country mired in corruption and was faced with a war to make me fail," he said, naming several officials he believed wanted to "turn the clock back" to the Mubarak era, including politicians, judges and journalists.
"Political polarisation and conflict has reached a stage that threatens our nascent democratic experience and threatens to put the whole nation in a state of paralysis and chaos," he warned.
"The enemies of Egypt have not spared effort in trying to sabotage the democratic experience."
Mr Morsi called on opposition figures to "enter elections if you want to change the government" and criticised them for refusing to take part in a national dialogue.
The head of the army earlier warned it would not allow Egypt to slip into "uncontrollable conflict".
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