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.

Netanyahu orders deeper Israeli incursion into Lebanon
Blast in Myanmar village reportedly kills 55 and injures dozens more
US military says it turned away blockade runner trying to reach Iranian port
Two hundred hurt in post-game violence as Paris hails second Champions League triumph
Illegal mine collapses in China, killing five just days after Shanxi disaster
