Tenzin Delek Rinpoche's sister Dolkar Lhamo and his niece ; Nyima Lhamo were arbitrarily deatined on 17 July from a restaurant in Chengdu after Dolkar Lhamo submitted a petition calling for an investigation into the death of Rinpoche ; following peaceful protest by followers of Rinpoche and other local Tibetans in Rinpoche's hometown in Ngagchuka