Three people were killed and five wounded in the city's northern Shaab district when a motorcycle charged with bombs was detonated, Iraqi security and medical sources said.
A second motorcycle exploded in the southwestern Bayaa district, killing two and wounding six, while an improvised explosive device blew up in the eastern Baladiyat district, killing one person and wounding four.
Since the Islamic State of Iraq and the Levant (ISIL or ISIS) was overthrown, the number of such explosions in the Iraqi capital had decreased. The sources of the attacks are unknown at this time.
Iraqi officials announced earlier on Tuesday the death of two anti-government demonstrators killed by security forces while 21 others were wounded following clashes with security forces in the capital.
One of the victims was killed by a rubber-coated bullet fired by security forces on Rasheed Street near the strategic Ahrar Bridge.
Protesters transported the dead demonstrator, his face covered in blood, away from the scene of the combat to a tuk-tuk - a common form of urban transport in Iraq - for medical assistance, while police continued to use live ammunition, tear gas and rubber-coated rounds to stop protesters from scaling barricades.