Despite Iraqi Prime Minister Adel Abdul Mahdi's plea to end anti-government protests, thousands gathered at Baghdad's Tahrir Square on Monday.
Operations at Iraq's main Gulf port of Umm Qasr have been at a complete standstill since last week.
On Sunday night, Mahdi appealed to protesters to suspend their movement, saying it was hurting the economy.
He added that he's willing to quit if politicians agree on a replacement and promised a number of reforms.
The protesters, however, said it wasn't enough and demanded that the entire political class step down.
Since October 1, more than 250 people have died in the anti-government protests.

Tanzania's Hassan declared landslide winner in election marred by violence
Vietnam's ancient town Hoi An works to restore tourism after devastating floods
Indian temple stampede kills nine, injures several
Turkey to host Gaza meeting amid ceasefire concerns
Tanzania opposition says hundreds killed in vote protests
Turkey sentences 11 people to life in prison over ski resort hotel fire
China sends its youngest astronaut to 'Heavenly Palace' space station
Israel launches more strikes on Gaza overnight, testing fragile truce
