Hackers stole information from the U.S. Department of Transportation and several U.S. companies by seducing employees with fake job-listings on advertisements and e-mail, a computer security firm said.

The victims include consulting firm Booz Allen, computer services company Unisys Corp, computer maker Hewlett- Packard Co and satellite network provider Hughes Network Systems, a unit of Hughes Communications Inc, said Mel Morris, chief executive of British Internet security provider Prevx Ltd.

Of the list, only Unisys acknowledged that viruses had been detected and removed from two PCs, saying no information had been leaked. A Department of Transportation spokeswoman said the agency could not find any indication of a breach and a spokeswoman for Hughes said she was unaware of any breaches.

The other parties either declined comment or did not respond to requests for comment.