Lebanese police fired tear gas to try to disperse rock-throwing protesters blocking a road near parliament in Beirut on Sunday in a second day of anti-government demonstrations triggered by last week's devastating explosion.

Fire broke out at an entrance to Parliament Square as demonstrators tried to break into a cordoned-off area, TV footage showed. Protesters also broke into the housing and transport ministry offices.

Two government ministers resigned amid the political fallout of the blast and months of economic crisis, saying the government had failed to reform.