Thousands of Armenians protested in the capital, Yerevan, Friday against the policies of President Serzh Sarkisian, demanduing the immediate release of supporters detained during bloody demonstrations last March that saw nine people killed, according to dpa. Opposition politician Levon Surabian announced at the unauthorised rally that the protesters would begin a 28-day sit-down. "We cannot go home while our friends are in prison," he declared. Opponents say Sarkisian has refused all dialogue with the opposition since his February 19 election in a contested vote. Organisers of Friday's protest said it attracted 30,000 demonstrators, but police put the figure at 5,000. Surabian announced further protests for the coming weeks to pressure Sarkisian. According to local journalists, there had been a high number of arrests during a 20-day state of emergency following the March violence. The small Caucasus state of 3.2 million has emerged as a strategically important region, lying along gas routes from the energy-rich Caspian Sea region to Europe and being a close partner of Iran. Western powers fear instability in the region could disrupt gas routes and further undermine a fragile security situation with Armenia's neighbours Georgia, Azerbaijan and Turkey.