In the southern port city of Aden, protesters marched through the Mansoura district, waving the old flag of South Arabia and chanting 'Revolution, revolution for the south', the Christian Science Monitor reported.
Just hours before that march, security forces had fired live ammunition during a protest on the same street.
Hundreds more staged demonstrations throughout Aden, as well as in other cities across Yemen's south.
"After Hosni Mubarak, Yemen is going to be next. I know it," said Zahra Saleh, a prominent secession activist watching the scenes in Cairo on a TV set in a small Aden office.
"Now our revolution has to be stronger," declared Ali Jarallah, a leader in the southern separatist movement.
In Sanaa, anti-government protests have focused on pressuring the ruling party to accept political reforms. However, in Yemen's south, the increased number of demonstrations since Tunisia's uprising have been more violent.
"Demonstrations are allowed to happen in Sanaa without weapons, why do they use weapons on us in the south?" asks secession activist Wagdy Al Shaaby.
He criticized the US for supporting its Arab allies, even when they resort to authoritarian measures in the name of stability.
"America always supports oppressors," he says. "America protects these countries until they blow up."
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