Anti-corruption campaigners have attacked the British government's financial support for a UK-based subsidiary of Halliburton that is part of a consortium under investigation over bribery allegations. The consortium is alleged to have paid $180m (?149m, £99m) in bribes to secure a construction project in Nigeria. In a letter to the UK's Department of Trade and Industry, a group of five pressure groups claims the British government failed to vet properly the consortium's work on a multi-billion dollar natural gas project under construction in the country.