'We do not condone such fear-mongering tactics,' Special Branch chief Mohamed Farid says.
The activists had organised events supporting Hong Kong's anti-extradition to China movement.
IGP Abdul Hamid Bador admits the SB was used by the previous administration to silence dissidents.
The party says there is no ban on police personnel attending its events.
WANG KELIAN RCI | He says this happened when their lock-ups became full.
UPDATED 7.50PM | WANG KELIAN RCI | 'The camps were made of wood and covered with canvas.'