A series of massive bombs ripped through residential buildings across Baghdad on Tuesday, killing 35 people and wounding 140 others in the second attack with multiple casualties in the Iraqi capital in three days.

"The latest reports said that 35 people were killed and 140 others wounded in Baghdad blasts," an Interior Ministry source told Xinhua on condition of anonymity.

The source said that seven coordinated explosions hit the capital on Tuesday morning to target residential buildings across the capital.

The first blast started at about 8:45 a.m.(0545 GMT) in Chikok area in northern Baghdad neighborhood of Kadhmiya, causing the collapse of two residential buildings, the source said.

About 10 minutes later, another massive blast destroyed a third building in the Shula neighborhood in northwestern Baghdad, the source said, adding that another powerful explosion occurred in a fourth building in the southwestern Shurta al-Rabia neighborhood.

A fifth explosion rocked the Hifa street in central Baghdad, the source said without giving further details about the incident, but said the blast was apparently carried out by a suicide bomber.

The sixth explosion took place in the al-Amil neighborhood in southern Baghdad, the source said without disclosing details.

A seventh blast destroyed a residential building in Baghdad's southern district of Saidiyah, he added.

The attacks came two days after a series of deadly suicide bombings against foreign embassies in Baghdad.

On Sunday three suicide bombers detonated car bombs within minutes of each other targeting foreign embassies, killing 30 people and wounding 224 others, including security forces.

Sporadic attacks continue in Iraq about a month after the country held its landmark parliamentary election which is widely expected to shape the political landscape of the war-torn country.

However, observers warn that political turmoil will destabilize the country and complicate Iraq's situation as the U.S. troops in Iraq are slated to be cut by half at the end of August and to fully withdraw by the end of 2011.