A hostage held alongside Mr Wood [recently released Aussie ex-hostage] has hired bounty hunters to track down his former captors, promising to eliminate them one by one. Ulf Hjertstrom, a Swede who was held for several weeks with Mr Wood, was freed by his kidnappers on May 30. He has since said he shared information with US and Iraqi troops that led to the Australian's release. Now, he wants to find those responsible. "I have now put some people to work to find these bastards," he said yesterday. "I invested about $50,000 so far and we will get them one...