A group calling itself the Islamic State Hacking Division published what it said were the names and addresses of 100 US military staff and urged IS supporters to kill them, a monitoring group said today.
The allegedly hacked information about members of the air force, army and navy included photos and ranks of personnel, SITE Intelligence said.
The hacking group said it took the information from government servers, databases and emails.
The self-proclaimed hackers said the 100 military staff had targeted the Islamic State group in Iraq, Syria and Yemen, and called on sympathisers to mount attacks.
The US Defence Department and FBI officials told The New York Times they were aware of the threats and were investigating the website.
But a defence source told the newspaper most of the information was in fact available in public records and did not appear to have been hacked from US government servers.
The Pentagon is contacting the individuals named and advising them to check their online footprint and ensure privacy settings are adjusted to limit the amount of information available.