Depleted uranium has been discovered at Opa-locka Executive Airport near Miami and a hazmat team is on the scene, according to reports.
Breakingnews.com and NBC Miami reported the material was found in a 55-gallon drum inside a locked airplane that is no longer in use.
Minimal levels of radiations have been detected, authorities said.
Most deplete uranium is a byproduct of the production of enriched uranium, which is commonly used in nuclear reactors and weapons. It has significantly less radiation than natural uranium.
No other details were immediately available.
Associated Press contributed to this article.