Many dead in Baghdad market blasts
More than 18 people are killed in a bomb attack and two US aircraft crash near the capital.
Helicopters down
Meanwhile, two US military helicopters crashed north of Baghdad, killing two soldiers and injuring five, the US military said.
In a statement, the US military said it appeared the incident was caused by a mid-air collision and not an attack.
The military gave no information on the type of helicopters involved in the crash near a large US air base in Taji and said an investigation was under way.
Fighters shot down eight helicopters during a month-long period earlier this year, killing 28 people, mainly American soldiers. Six of those aircraft were US military helicopters and the other two belonged to a private American security company.