Hundreds of protesters in Egypt's second largest city, Alexandria, blocked roads and tramways around one of the main squares in the city.
Scuffles broke out between tram drivers and a number of protester blocking the route, according to local media.
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Seventeen people – including nine members of the same family – were killed in the accident.
A group of MPs and peers has said the roll-out of the project should be reviewed immediately.
The ex-combatants were sworn in on Friday.