The US military says it is investigating the alleged killing of 10 civilians in air strikes on insurgents in the southern Iraqi city of Diwaniya.
The US said it was targeting a suspected source of mortar fire
F-16 fighter planes hit a street in the city on Monday after militants fired mortars and rockets at a military base.
Separately, the US said 23 insurgents were killed in a weekend operation in the western Anbar province.
US-led forces there said they found militants preparing for suicide attacks in the province's capital Ramadi.
Meanwhile two US pilots were slightly hurt when their helicopter was shot down by enemy fire near Baghdad.
After the incident, a US warplane destroyed the wreckage of the aircraft with two laser guided bombs.
In other developments:
- Human Rights Watch issued a report detailing torture and abuses at security facilities in the Kurdish area of northern Iraq
- Two US troops died in an accident during combat operations in Anbar on Sunday
- A car bomb targeting a police patrol in the northern oil city of Kirkuk killed two and injured at least nine people