100 casualties' in Iraq attack A mortar attack on an Iraqi National Guard headquarters north of Baghdad has caused many casualties, Iraqi officials have said. There is so far no clear breakdown on the number of dead, but more than 100 people are believed to have been killed or injured, the officials said. Six mortar rounds fell on the building in Mashahidan, 40km (25 miles) from the Iraqi capital, AP news agency said. Two American field hospitals are treating the wounded. US Blackhawk helicopters are also helping to evacuated the injured, AP reported. Iraq's fledgling security forces have been a...