|Egypt tightens security, warns Muslim Brotherhood||
Egyptian authorities warned the Islamist Muslim Brotherhood on Saturday against staging violent protests and tightened security in all cities and strategic installations after clashes on Friday killed at least four people.
Supporters of deposed Islamist President Mohamed Morsi on Friday mounted their boldest demonstrations since troops crushed their protest camps demanding his reinstatement on August 14.
Both opponents and supporters of the Brotherhood have called for mass protests on Sunday, when the country plans to celebrate the anniversary of an Egyptian attack on Israeli forces in the Sinai during the 1973 war.
"The Ministry of Interior asserts its determination on confronting violence and infringements of the law by Muslim Brotherhood supporters," a ministry statement said.
The military boosted its presence around Tahrir Square - where hundreds of thousands of Egyptians demonstrated during the revolt that toppled autocrat Hosni Mubarak in 2011 - after clashes on Friday in several cities.
On Saturday afternoon, about 1,000 Morsi supporters tried to reach the Rabaa al-Adawiya mosque area in northeast Cairo, where security forces crushed one of their protest camps in August. All but about 50 were turned back by police, who fired tear gas, security sources said.
Political tensions have gripped Egypt and hammered the economy since the army ousted Morsi in July, installed an interim government and presented a political roadmap it promised would bring fair elections.
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