rtokens: Earlier on Friday some of the students , who were held briefly by police during the protests earlier this week , said they were still dissatisfied with the military government .
pos: NNS VBD VBN CC VBN .
tokens: Thousands were killed or imprisoned .
ltokens: The street protests were the biggest seen in the capital since the student-led pro-democracry demonstrations of September 1988 when the junta crushed the uprising .