The demonstration reflects the divisive makeup of Libya, where rival groups and tribes all demand government representation.
"Public concerns about police tactics at the G20 demonstration reflect the concerns we had after the Southall demonstration when Blair was killed," said Stubbs.
"I think the current demonstrations reflect that anger and that frustration".
Those demonstrations reflected a growing tension in Western Europe as governments reassess the affordability of their pension systems and citizens chafe against the prospect of diminished entitlements.
The persistence of the demonstrations reflects deep unhappiness with economic hardships and strong-arm government rule in one of the most repressive nations in Asia, analysts said.
Political analysts in Bangladesh say the youth demonstrations reflect broad public disenchantment with the usual style of Bangladeshi politics.
But the anger of the fringe groups that are holding demonstrations reflects a broad resentment of the United States and opposition to its bombing of Afghanistan.
The demonstrations reflect increasing sectarian tensions in Iraq, which is struggling to maintain stability nearly a decade after an invasion led by the United States toppled Saddam Hussein's Sunni-dominated government, and a year after the last American troops withdrew.
On Thursday, members of the reformist movement in Parliament and around President Mohammed Khatami played down the seriousness of the demonstrations, saying they reflected the country's attempt to engender broader democracy.
Rousseff's press office welcomed the peaceful nature of the demonstrations, saying it reflected the maturity of the country's democracy.
