The suspect was transferred to the police detention cell.
Life in a detention facility is harsher than one might imagine.
留置所 is a small police-run holding facility for short-term detention, whereas 拘置所 is a larger Ministry of Justice facility for suspects awaiting trial.
Compound of 留置 (りゅうち, 'detention') and 所 (しょ, 'place'). The term is a straightforward Sino-Japanese construction referring to a place of detention.