US Defense Secretary Ash Carter said Tuesday that a US serviceman was killed "in the neighborhood" of Erbil in Iraq's northern Kurdistan Region. "It is a combat death, of course. And a very sad loss," Carter told reporters in Germany. The incident happened in the vicinity of Tel Skuf, about 28 kilometers north of Mosul, a Rudaw reporter said, quoting military sources. The body was retrieved by a US helicopter. Tuesday's death of a US serviceman would be the second in northern Iraq since March, when a Marine was killed in an ISIS mortar attack on an Iraqi military base in Makhmour, some 50 kilometers south of Erbil.