The mop handles on the 28th floor of Wanghe Building were all confiscated.
To be on the safe side, the mops from the restrooms and storage rooms on the 27th and 29th floors were also collected.
To be extra cautious, the mops from the first and second floors, including the two used by the security room, were likewise gathered.
The murder weapon is given high priority during the trial of a homicide case, as it is an indispensable part of the evidence chain.
Investigative agencies will obtain it whenever possible.
Soon, the mop handle from the restroom on the 28th floor, which was very close to the incident scene, unsurprisingly stood out from the pile of mop handles.
For a foreseeably long period, it would be properly preserved. With some luck, it might last for several decades.
Meanwhile, the discovery of new evidence allowed the case to take a significant step forward.
The special case group was formally established at last.