Two roadside bomb attacks and gunfire during a US forces' raid in eastern Baghdad Tuesday killed three people and wounded seven, a police source said.

A roadside bomb went off in the morning at the entrance to a communication centre in Baghdad's neighbourhood of Zaiyounah, killing a civilian and wounding five, the source told Xinhua on condition of anonymity.

Separately, a US force stormed a house in the same neighbourhood, killing two people inside the house and detaining another, the source said.

The objective of the US raid was not clear yet, he added.

Another roadside bomb explosion struck a US patrol near the Beirut Square on the Palestine Street in eastern Baghdad, wounding two civilians.

It was not known whether the US posse sustained any casualty as the troops immediately cordoned off the area preventing people and Iraqi police from approaching the scene.

The US military had no immediate word on the two incidents concerning its troop activities in the capital.

Violence persists in Iraq as sectarian killings, suicide attacks, bombings and abductions claim dozens of Iraqi lives daily.