(CNN) -- Authorities imposed curfews and limited access to city centers across Iraq as thousands of protesters demanded economic progress and an end to corruption, police said.

Demonstrators were reported to be gathering in Baghdad, Basra, Nineveh, Anbar and Salaheddin.

The developments follow weeks of demonstrations across the country by protesters angry about unemployment, poor basic services, corruption and a lack of freedom. At least 13 people died in protests on February 25.

"Liar, liar, Nuri al-Maliki," some protesters were heard shouting in Baghdad. "Al-Maliki has become like Saddam," others said, referring to former leader Saddam Hussein.

"We have elected you to protect us and not to kill us," one banner said.

After an emergency cabinet meeting on Sunday, Iraqi Prime Minister Nuri al-Maliki gave government ministers 100 days to deliver results and eliminate corruption or be fired.

"We live in a country rich with oil, yet we don't have jobs," demonstrators said. "The oil for the people and not for thieves."

In Baghdad, police imposed a ban on the movement of vehicles across the city, forcing protesters to walk several kilometers to Tahrir Square.

Still several thousands gathered there after Friday prayers.