A senior U.S. general said on Wednesday it will be difficult to maintain "extraordinarily high standards" to avoid civilian casualties in Mosul, even as the U.S. military begins a formal investigation into an explosion in the Iraqi city that is believed to have killed scores of civilians. The U.S. military has acknowledged the U.S.-led coalition probably had a role in the March 17 explosion but said Islamic State also could be to blame. Local officials and eyewitnesses say as many as 240 people may have been killed in the Al-Jadida district when a huge blast caused a building to collapse, burying families inside. When asked in a congressional hearing about the standards used by the U.S. military to avoid civilian casualties, General Joseph Votel said it would be difficult to apply those standards in the narrow, crowded streets of the Old City in west Mosul. "I do agree that as we move into these urban environments, it is going to become more and more difficult to apply e
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