BAGHDAD — A pair of suicide car bombings Sunday devastated the heart of Iraq’s capital, killing at least 147 people in the country’s deadliest attack in more than two years. The bombs targeted two government buildings and called into question Iraq’s ability to protect its people as U.S. forces withdraw.

The bombings show that insurgents still have the ability to launch horrific attacks even as violence has dropped dramatically in Iraq. Many fear such attacks will only increase as Iraq prepares for crucial January elections.

The dead included 35 employees at the Ministry of Justice and at least 25 staff members of the Baghdad Provincial Council, said police and medical officials speaking on condition of anonymity because they were not authorized to speak to the media. At least 721 people were wounded, including three American contractors.

The street where the blasts occurred had just been reopened to vehicle traffic six months ago. Shortly after, blast walls were repositioned to allow traffic closer to the government buildings. Such changes were touted by Iraq’s Prime Minister Nouri al-Maliki as a sign that safety was returning to the city.

The Iraqi leader walked among the mangled and blackened cars, which lay in front of blast walls that had been decorated with peaceful street scenes of Iraq. At the Justice Ministry, windows and walls on both sides of the street were blown away, and blood pooled with water from burst pipes.

Al-Maliki has staked his political reputation and re-election bid on his ability to bring peace to the country and pledged to punish those responsible, who he said wanted to “spread chaos in the country, undermine the political process and prevent the holding of parliamentary elections.” But the Sunday attacks seemed designed to paint the Iraqi leader as incapable of providing security to the beleaguered city, undermining much of his political support.

The attacks occurred just hours before Iraq’s top leadership was scheduled to meet with heads of political parties in order to reach a compromise on election guidelines needed to hold the January vote.

President Barack Obama, who earlier this week reaffirmed the U.S.’s commitment to withdrawing its troops from the country, called al-Maliki to offer his condolences.

“These bombings serve no purpose other than the murder of innocent men, women and children, and they only reveal the hateful and destructive agenda of those who would deny the Iraqi people the future that they deserve,” Obama said.