Some 100 people have been killed in and around Baghdad in one of the bloodiest days in Iraq in weeks.

In the deadliest attack Tuesday, a double bombing near a university killed at least 65 people and wounded more than 100 others.

Iraqi Prime Minister Nouri al-Maliki blamed the attack on what he called "terrorists and Saddamists." He linked the bombings to the executions on Monday of two former officials from Saddam Hussein's ousted government.

Meanwhile, the U.S. military said a roadside bombing killed four American soldiers Monday in northern Iraq.

And a top U.N. official in Baghdad, Gianni Magazzeni, announced that more than 34,000 Iraqi civilians were killed and more than 36,000 wounded in violence last year.

The figures are much higher than Iraqi government estimates.

Magazzeni said the situation is particularly grave in Baghdad, where most casualties and unidentified bodies are recorded daily.

Some information for this report was provided by AFP, AP and Reuters.