A car bomb has killed up to 17 people and wounded more than two dozen in Mahmudiya in Iraq.
The explosion left a crater about one and a half meters deep.
It demolished a three-storey building, as well as smaller shops.
A hospital official said there are bodies still buried in the rubble.
The government has said it will spread its security offensive in the capital, to other embattled cities, targetted in a spate of recent attacks.
Meanwhile in Najaf, supporters of Iraqi cleric Muqtada al-Sadr have begun preparing for a mass protest on Monday.
The cleric has called the rally to mark the fourth anniversary of the fall of Baghdad in the US-led invasion.
Around one million people are expected to take part and unite in a call for coalition troops to leave the country.
The authorities are imposing a 24-hour vehicle ban in Baghdad on Monday afternoon, to prevent car bombing attacks on the anniversary.