Seven people including a tribal chief were killed on Saturday in attacks west of Baghdad and in the capital itself, police and medics said.
A roadside bomb at Amariyat al-Fallujah in Anbar province killed Sheikh Najem Mustafa al-Hafez, head of the Aweissat tribe, along with his brother, his wife and their two-year-old son, police lieutenant Jabbar Hamad said.
Hamad said Hafez was well-known for his hostility to insurgents and his loyalty to the police and army.
A doctor at Fallujah hospital 60 kilometres (37 miles) west of Baghdad confirmed that the facility had received four bodies after the incident.
The hospital also received the remains of two people killed when a magnetic bomb attached to their car in the city exploded.
In the capital, an interior ministry employee named as Haidar Shamki was killed when unidentified gunmen opened fire on his car in east Baghdad, a ministry official said.