Authorities didn't immediately say what may have prompted the incident in Amarillo, a city in the Texas Panhandle.
The official confirmed that these are the first four Americans that "we've facilitated in this manner" since the withdrawal of US troops from Afghanistan.
US President Obama -- accompanied by National Teacher of the Year Shanna Peeples of Amarillo, Texas -- left the White House for a block-long walk to a tea shop.
The Pentagon has awarded Bell Helicopter a contract to manufacture and deliver the choppers to Pakistan under its foreign military sales funds.
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