A complaint lodged with the Pentagon has prompted the U.S. Navy to look into the possible presence of something causing cancer at the base at Guantanamo Bay, Cuba.

Base spokeswoman Kelly Wirfel says a complaint to the Department of Defense Inspector General raised concerns about the possibility of carcinogens at the site used for proceedings for prisoners charged by military commission.

Wirfel said Tuesday that officials are taking the complaint seriously but have not reached any conclusions.

The identity of the person who lodged the complaint has not been released.

The military commission site is on a former airfield and includes courtrooms and offices for lawyers and support staff.

Lawyers say there appear to have been an unusual number of cases of cancer among people who have worked there.