US soldiers were killed in an Iranian drone strike at a civilian port in Kuwait

An operations center targeted by an Iranian drone strike that killed 6 American soldiers on Sunday was located in the heart of a civilian port in Kuwait, miles away from the main Army base, according to satellite images and a U.S. official.

The husband of one of the slain soldiers, who was part of a supply and logistics unit based in Iowa, told The Associated Press on Tuesday that the hub was a shipping container-style building and had no defenses.

The development, reported earlier by CNN and CBS News, raises questions about the safety precautions that the U.S. military had in place as it, along with Israel, launched an attack on Iran, which has responded with retaliatory strikes against several countries in the region, including Kuwait. Donald Trump and top defense leaders say more American casualties are likely.