At least 11 people were killed and 30 others were injured in five explosions that rocked the Iraqi capital on Tuesday morning, an Interior Ministry source said.

"Our reports till now put the toll at 11 killed and 30 others wounded from the five blasts this morning in Baghdad," the source told Xinhua on condition of anonymity.

The massive blasts started at about 8:45 a.m. (0545 GMT) in the Chikok area in Baghdad northern neighborhood of Kadhmiya, causing the collapse of two residential buildings, the source told Xinhua on condition of anonymity.

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 toll could rise as many ambulances, military vehicles and civilian cars were busy evacuating casualties to Baghdad hospitals. Plumes of smoke could be seen above the bombarded areas.

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

Baghdad witnessed the deadliest attack recently on Sunday when 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.