A、Before a routine check. B、After a prison break. C、Before a gunfire. D、After an argument. D新闻中提到，澳大利亚媒体说，一名犯人与一名警卫就一难民的死亡而争吵起来，

There’re reports of fights at an Australian immigration detention center on Christmas Island following the death of a refugee.(5)Australian media say the fights started after an argument between a prisoner and a guard about the death. Jon Donnison reports from Sydney. "The Australian Immigration Ministry has confirmed there have been what it calls disturbances at the Christmas Island detention center. There are reports some security guards abandoned their positions with fences torn down and fires lit. Fazel Chegeni was found dead at the bottom of a cliff after he apparently managed to escape from the centre on Friday.(6)Around 200 shelter-seekers are held on Christmas Island which is one of several offshore detention centers operated by Australia.(7)The country has been widely criticized by human rights groups for its treatment to the shelter-seekers but the government here says its tough polices have worked and stopped people trying to reach Australia shores by boat. "
5. How did the fights take place?
6. How many refugees are held on Christmas Island?
7. What is Australia criticized for?