Workers were attacked on Friday evening when the boat with ChevronTexaco contractors and their military escorts were returning from work.
Six bodies had been recovered from the remote area of river channels and mangrove swamps, including two American contractors who worked for Houston-based engineering company International Building Systems.
"Preliminary information indicates the attack was by heavily armed militants who wanted to dispossess the security personnel of their weapons," the company spokesman said.
A ChevronTexaco employee and a Nigerian soldier were wounded, one Nigerian was missing.




