Swiss inspections group SGS denied on Thursday any responsibility for security at the site where radioactive material used to test pipes at an oil field in southern Iraq disappeared last year.
It also said the radioactive content was most likely very weak.
"The site where these operations are conducted is fully secured and guarded by security guards under the responsibility of the owner of the site. SGS does not assume any responsibility for the site security and does not control accesses," it said in a statement on Thursday, adding that many contractors used the site.