Hong Kong police began searching a landfill Tuesday for evidence related to the grisly killing of model Abby Choi, whose dismembered body parts were found in a refrigerator and pots.

Ex-husband Alex Kwong, his father Kwong Kau and his brother Anthony Kwong were charged with murder after police found her remains in a house rented by Kwong Kau in a suburban part of Hong Kong near the border with mainland China. Alex Kwong’s mother, Jenny Li, faces one count of perverting the course of justice. All four were detained without bail.mainland China, to search for the missing body parts with excavators and shovels. Police had said earlier they were still looking for her hands and torso.

The suspects threw away several bags of important evidence in the morning of Feb. 22. They may be some human body parts or they could be the clothes and the phone of the victim, or even the weapons,” Superintendent Alan Chung told reporters.

Chung said they could not find anything substantial yet, other than bones, which police could not ascertain if they belonged to a human or animals.