The U.S. ambassador to Afghanistan, Ryan Crocker, is leaving his post in mid-summer, State Department spokeswoman Victoria Nuland confirmed in an email to reporters just after 11:30 a.m. ET.

Crocker's departure is due to "health reasons," Nuland added.

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Ryan Crocker, the U.S. ambassador to Afghanistan, "is expected to step down soon from his post," sources familiar with the matter tell Reuters and a few other news outlets.

CNN adds that while Crocker, a veteran diplomat who reopened the embassy in Kabul in January 2002 and later served as ambassador to Iraq during President George W. Bush's administration, has been ambassador in Afghanistan for just 10 months:

"The relatively short length of his service in the Afghan capital is no surprise. In recent history, American ambassadors have served similar terms."

Last week, The Washington Post reported that "Marine Corps Gen. John Allen, the top commander in Afghanistan, is expected to leave his post early next year and take over the U.S. European Command."

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