In Penang, the police had earlier today posted notices - signed by Georgetown OCPD Asst Comm Gan Kong Meng - around the Speaker's Square in Georgetown warning against any illegal gathering in the area.
At the same time, about 10 persons suddenly appeared claiming to represent "those who support the ISA".
Even before the vigil began at 9pm, two activists - Choo Choon Kai and Kris Khaira from PSM - were arrested.
By 8.45pm, the police asked the crowd - numbering around 100 as opposed to the 200 police personnel who had been mobilised - to "disperse in five minutes."
Two more activists - lawyer Darshan Singh and Ong Jing Cheng of Suaram - were subsequently taken by the police to Jelutong district police station.
Video by Jimmy Leow