Two terror attacks killed at least 67 people in Iraq on Saturday.
A car bomb exploding near a bus station in Karbala, one of the Shi'ites' holiest sites, killed at least 56 people.
Shortly afterwards a main bridge over the Tigris river in Baghdad collapsed in a blast, killing 11 people.
Iraqi officials expressed fears that insurgents were escalating their struggle by targeting the country's most important sites.
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