Many Egyptians have lost confidence in the government of prime minister Essam Sharaf, who they say has failed to deliver on promised reforms five months after a popular uprising led to the topping of President Hosni Mubarak's administration.

Protesters, who have been camping in Cairo's main Tahrir Square since Friday, blocked thousands of government workers from entering one of the city's most iconic administrative buildings on Sunday.

Among the various demands, protesters want country's military leaders, who have assumed much power, to properly try sacked members of the security forces accused of killing demonstrators during the revolution.

Al Jazeera's Ayman Mohyeldin reports from Cairo.