The Islamic State (IS) has called on its members in the United States to kill 100 military service members, after publishing their details including names, photos and purported addresses on a website, media reported Sunday. The "Islamic State Hacking Division" hacked several military servers, databases and emails and published information on U.S. military personnel, for the "lone wolf" attackers to kill them. The Pentagon said it was investigating the matter after it was announced. "I can't confirm the validity of the information, but we are looking into it," a U.S. defense official, speaking on condition of anonymity, said on Saturday. "We always encourage our personnel to exercise appropriate OPSEC (operations security) and force protection procedures," the official added. The New York Times suspected the information had been hacked from U.S. government servers, but quoted an unnamed Defense Department official as saying most of the information could be found in public records, social media, and residential address search sites.