Iraq is searching for ¡°highly dangerous¡± radioactive material stolen last year, according to an environment ministry document and seven security, environmental and provincial officials who fear it could be used as a weapon if acquired by Islamic State.

The material, stored in a protective case the size of a laptop computer, went missing in November from a storage facility near the southern city of Basra belonging to U.S. oilfield services company Weatherford, the document seen by Reuters showed and officials confirmed.

A spokesman for Iraq¡¯s environment ministry said he could not discuss the issue, citing national security concerns.