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http://www.centcom.mil/MEDIA/PRESS-RELEASES/Press-Release-View/Article/1291088/us-blackhawk-helicopter-crashes-off-yemen-coast/

From The Independent:

Asked if the crash was linked to a special forces raid, Central Command officials said: “This was a routine training event specifically for US military personnel.”

They added: “Training events such as this are routinely held by US forces within a theatre of operations in order to maintain their proficiency within the operating environment.

“Commanders deemed this location appropriate and safe for a routine training event, considering both the operational environment and weather conditions at the time.”