BAGHDAD — Polls have closed across Iraq Saturday evening in the first national election since the country declared victory over the Islamic State group. The vote — the fourth since the 2003 U.S.-led toppling of Saddam Hussein — was marked by reports of low turnout and irregularities.

Results are expected within the next 48 hours according to the independent body that oversees Iraq's election, but negotiations to choose a prime minister tasked with forming a government are expected to drag on for months.

Voting began early Saturday morning in a contest that had no clear front-runner after weeks of official campaigning. Iraqi Prime Minister Haider al-Abadi's stiffest competition came from political parties with closer ties to Iran.

Baghdad's streets began to fill up with cars before voting concluded Saturday evening after al-Abadi partially lifted a security curfew in an effort to improve turnout. Nearly all civilian vehicles had been banned from Baghdad's streets Saturday morning and many voters complained of having to walk more than 2.5 miles to reach polling stations.

Iraq's most senior Shiite cleric spoke out on the issue of voter participation Saturday afternoon, encouraging Iraqis to vote "to prevent the arrival of a corrupt parliament."

"The lack of participation will give the opportunity for others to reach parliament and they will be very far from the aspirations of the people," said Sheikh Abdul-Mahdi al-Karbalai, the representative of Grand Ayatollah Ali al-Sistani, on local Iraqi television from Karbala. Sistani has repeatedly encouraged Iraqis to vote into power Saturday a new political class to combat corruption.

In Mosul, turnout appeared to be higher with over 40 percent of eligible voters casting their ballots at polling stations across the city, according to the deputy commander of Nineveh operation command, Brig. Gen. Jassem Mohammed Khalil.

For those who did attempt to vote, some in Baghdad complained of voting irregularities at polling stations linked to a new electronic voting system implemented for the first time this year in an effort to reduce fraud.

Nouri al-Maliki, al-Abaid's predecessor and arguably his most powerful opponent, said he was aware of "violations" at some polling stations in Iraq, adding that the process lacked proper oversight.

"We are not reassured," al-Maliki told the Associated Press in a phone interview.

Thamer Aref, 45, along with his wife and daughter were turned away from a polling station north of central Baghdad.

Aref had turned in his old voter ID card months ago for the biometric identification card required by the new system. However, Aref's biometric card wasn't ready ahead of Saturday and, with neither card, the polling station did not allow him to a cast a ballot.

"I lost my right to vote," he said.

Associated Press journalists documented several similar cases at a number of different polling stations across Baghdad on Saturday morning.

Amira Muhammed, the supervisor of a polling station in Azamiyah, Baghdad, said some people couldn't vote because they did not pick up their new biometric ID cards in time.

"The problem is not with us," she said. 

A member of Iraq's electoral commission also deflected blame for Saturday's reported irregularities.

"There were some problems with the electronic equipment due to misuse by some employees," Hazem al-Ridini told the AP.

Associated Press writers Balint Szlanko and Salar Salim in Mosul, Iraq, contributed to this report.