Police shut off all exits from Hong Kong Polytechnic University but one, warning that they will answer bricks, arrows and Molotov cocktails with live ammunition.
The decision comes after the EU says continued rights violations in Cambodia will lead to the withdrawal of its preferential trade status.
The eight planned to champion human rights and protest dam projects at a major Buddhist festival.
Tran Vu Hai had offered to represent RFA contributor Truong Duy Nhat in court, but was then charged with tax evasion, with his case files seized by police.
NGO directed 13 refugees through China and Southeast Asia to safety using mobile phones last month.
Bishop Guo Xijin of Mindong diocese in the southeastern province of Fujian has evaded official minders who were trying to put pressure on him.
A mainland Chinese woman who is now settled in Hong Kong speaks out about the despair protesters feel in the face of government intransigence.
Protesters unblock, then reblock, a major highway after the government rules out meeting their demands.
The Muslim refugees said they were sailing for Malaysia in search of better lives.
Ongoing case against the two is part of government’s plan to “silence all critical reporting.”