Two firms from Belguim, who allegedly exported to Iran nuclear material that can be used to make weapons, are currently under investigation according to Belgium's energy ministry, according to a Wednesday AFP report.The companies sold materials that can be used for military or civilian means, including depleted uranium and zirconium powder to Teheran, ministry spokeswoman Marie-Isabelle Gomez told AFP.The energy ministry filed a complaint in 2008 against the two companies, which officials refused to identify, Gomez said, according to the report.