Extremists in the northern Iraqi city of Mosul killed three members of the same family, the US military reported on Friday.
According to the report, a mother, father and son were shot dead on Thursday in their home.
Meanwhile, in the central Iraqi province of Diyala, US troops said they discovered the bodies of four people who had likely been killed a year and a half ago. The bodies found buried in the area of Ghalibiya were those of two teenaged girls and two Iraqi soldiers.
On Friday, the US military in Baghdad detained two suspected members of the Shiite militia Kataib Hizbollah, a group believed by the US to be supported by Iran.

German exports plunged in November to record the biggest fall in nearly two decades, data released Thursday showed, as the deepening world economic downturn hits Europe's biggest economy.
When the Spirit rover landed on Mars five years ago, no one expected it or its sister rover Opportunity to make it to their first birthdays, let alone their fifth.
The San Antonio Spurs turned up their trademark defense down the stretch to turn back another opponent.
US singer and Academy Award winner Jennifer Hudson, 27, dominated the nominations for the 40th NAACP Image Awards.
After the Taipei Zoo received two giant pandas from China, another Taiwan zoo said Friday it is seeking to receive a pair of pandas from China.