翻译原文：

One week after a series of truck bombs hit two poor villages near the Syrian border, the known casualty toll has soared to more than 500 dead and 1,500 wounded, according to the Iraqi Red Crescent Society, making them by far the worst coordinated attacks since the American-led invasion.

Dr. Said Hakki, director of the society, said Tuesday that local Red Crescent workers registering families for aid after the explosions in Qahtaniya and Jazeera had compiled the new numbers, which dwarf the earlier estimates that at least 250 people were killed.

 The toll, Dr. Hakki said, may yet rise further. Among the wounded, one in five suffered serious injuries, such as head, chest or stomach damage, and emergency workers continuing to drag bodies from site’s dusty rubble.

Statistical certainty can be difficult to obtain after major bomb attacks. But the Red Crescent figures align with earlier estimates by hospital officials and track with the typical ratio of dead to wounded in Iraq’s largest bomb attacks.

 With these figures, the bombing would be the deadliest coordinated assault since the American-led invasion in 2003 by a factor of nearly three. In July, about 155 people died in a massive explosion in the northern town of Amerli; a similar number were killed in series of bombings and mortar attacks in the Sadr City neighborhood of Baghdad last November, and about 152 died in Tal Afar last month from a double truck bombing.

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