Two monks,identified as Tashi Woeser and Tashi Phuntsok,and two others were held after police raided the Worpu monastery as well as houses of monks and laypeople in Phetsa on Friday and Saturday nights.The two others were named as Soga and Guru Sangye.On March 23 night, Worpu monastery was under siege by Chinese police.The detentions came a week after seven Tibetan were sentenced to between eight and 12 years in jail for participating in January Nyagrong protests.The seven were paraded in the town to deter others from protesting against Chinese rule.