Nigeria's anti-corruption agency is to charge former US Vice-President Dick Cheney over a bribery scandal that involves a former subsidiary of energy firm Halliburton. Agency spokesman Femi Babafemi said that the charges were likely to be brought next week. The case involves engineering firm KBR, which has admitted bribing officials. Mr Cheney was Halliburton's chief executive before becoming vice-president to George W Bush in 2001. Mr Babafemi said the charges were "not unconnected to his role as the chief executive of Halliburton". KBR last year pleaded guilty to paying $180m (£115m) in bribes to Nigerian officials prior to 2007, when it was a subsidiary of Halliburton. The firm agreed to pay $579m (£372m)in fines related to the case in the US. But Nigeria, along with France and Switzerland, has conducted its own investigations into the case. Office raid The bribes concerned the construction of a liquefied natural gas (LNG) plant in southern Nigeria. KBR and Halliburton have now split, and Halliburton says it is not connected with the case against KBR. Halliburton denies involvement in the allegations. It has complained that a raid on its office last week by Economic and Financial Crimes Commission officials was "an affront against justice". Ten people were detained for questioning and later released. A prosecutor quoted by Agence France-Presse news agency said those charged would include former and current leaders of Halliburton and officials from firms in a consortium involved in the LNG plant. Nigeria is a member of the oil cartel Opec and is one of the world's biggest oil exporters. Source: BBC