article_snippet.sent: The incident, which has not been publicly disclosed, troubled U.S. military officials because the unsafe maneuver could have triggered a serious incident.
article_snippet.sent: The incident, which has not been publicly disclosed, troubled U.S. military officials because the unsafe maneuver could have triggered a serious incident also surprised U.S. commanders because in recent months Iranian forces have conducted exercises and operations in the region in a professional manner, one U.S. military official told CNN.
article_snippet.sent: a serious incident took place as the U.S. and other world powers meet with Iran in Switzerland to negotiate a deal limiting Tehran's nuclear program.
article_snippet.sent: The U.S. administration is considering a potential demarche protest against Iran, one U.S. military official said.
article_snippet.sent: The Pentagon has noted for the last several years that most encounters with the Iranian military at sea or in air are conducted professionally, but that some missions run by Iranian Revolutionary Guard Corps forces have been too aggressive against U.S. forces in the area.
article_snippet.sent: The U.S. military's concern has been that one of these incidents could escalate into a military encounter.
article_snippet.sent: the incident "might have been buffoonery" the official said, but there is always a risk from such actions.