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Protesters attempt to set fire to a christmas tree. Pro-Palestinian protesters clashed with police as they held a counter demonstration against pro-Israel campaigners in the Norwegian capital Oslo. Violent clashes lasted for hours  in the centre of Oslo. Both groups came to the streets as a result of the violence in Gaza. Israeli forces began a series of air strikes on the Gaza Strip on the 27th of December in retaliation against Hamas rockets fired into Israel. After eight days of bombardment, leaving over 400 Palestinians and four Israelis dead, Israeli tanks launched a ground invasion on the 4th of January.