KYIV (Reuters) - The U.S. embassy in Kyiv is working with the Ukrainian authorities to establish what caused the death of an American embassy employee, it said in a statement on Wednesday. “We are heartbroken to report the death of an American member of the U.S. Embassy Kyiv community,” the statement said. “Officials from U.S. Embassy Kyiv are currently working with authorities to determine the circumstances of the death.” Ukrainian authorities are investigating the death of the woman found by railway tracks in a park.