New clashes between police and protesters erupted on Wednesday in the Egyptian city of Port Said, the scene of several days of unrest, AFP reporters said.
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Tension has been running high around the main security building in Port Said, which was set ablaze on Tuesday for the second day in a row.
"Dirty government!" the protesters shouted, as they ran away from the thick gas.
The unrest in the Suez Canal city, fuelled by January death sentences handed down to football fans over deadly rioting last year, flared again on Sunday when clashes killed six people, including three policemen.