A court in Egypt has upheld death sentences on 183 supporters of the outlawed Muslim Brotherhood, on charges of killing police officers.<br /><br /> They had been convicted of taking part in an attack on a police station at Kardasa near Cairo in August 2013, in which at least a dozen officers died.<br /><br /> The initial sentences were handed down in December but were sent to the Grand Mufti, Egypt’s top religious authority, for ratification.<br /><br /> Hundreds of death sentences have been pronounced on Muslim Brotherhood supporters but none has been carried out.<br /><br /> Egypt has mounted one of the biggest crackdowns in its modern history on the Brotherhood since the political demise of Mohamed Mursi, the country’s first democratically-elected president.<br /><br /> Thousands of Brotherhood supporters have been arrested and put on mass trials in a campaign which human rights groups say shows the government is systematically repressing opponents.<br /><br /> Prosecutors say Mursi is to undergo a fourth trial in mid-February.<br /><br /> He is accu
