Supporters and opponents of ousted Egyptian President Mohammed Morsi clashed in central Cairo on Monday, leaving one person killed and seven others wounded, state television reported.
The two sides hurled stones at each other as security forces fired tear gas to try to disperse them, in the worst violence in the Egyptian capital since July 16, when seven died in confrontations.
Blood stains and broken glass littered the pavement between the dueling sides, and injured people were whisked away from the clashes on motorbikes.
State television said they had arrested seven Morsi supporters and confiscated two guns from them. A Reuters correspondent also saw two anti-Mursi activists holding homemade pistols, with the two sides shooting fireworks at each other.
A few hundred protesters backing Morsi's Muslim Brotherhood movement appeared to be trying to march on Tahrir Square, the epicentre of mass demonstrations which led Egypt's army to oust the elected Islamist leader on July 3.
"They fired on us with birdshot and pistols. They tried to overrun the square." said Tarik Sabir, 41, an employee in a petrol company, who was wounded in the thigh by birdshot. Around 100 people have been killed in violence since the downfall of Morsi earlier this month - most of them Muslim Brotherhood supporters. Monday's clashes were the latest instance of violence in and around Tahrir square, a focal point for demonstrations since mass protests there led to the downfall of veteran autocrat Hosni Mubarak in February 2011.
Also on Monday the European Union called for Morsi's release and demanded democratic elections as soon as possible. Morsi has been held at an undisclosed military facility since the Egyptian army removed him from office on July 3 and suspended the constitution in the wake of street protests against his one-year rule.
The army says Islamist Mursi is being held for his own safety.
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