The story
On March 31, 2004, four Blackwater security contractors were killed in an ambush in Fallujah, a city west of Baghdad, while protecting an ESS convoy en route to a Fluor construction site elsewhere. It has been widely but erroneously reported that the convoy attacked had been destined for a KBR location. That prompted a further contention that the contract between ESS and Blackwater for Iraq road transport and personnel close protection security, through a joint venture business formed by Blackwater and Regency Hotels of Kuwait, was known to Halliburton and therefore violated Halliburton's contract with the U.S. Army.
From Wikipedia’s article on Eurest Support Services, shared under CC BY-SA 4.0.3