An alleged ISIS sympathizer hacked into the social media accounts of a U.S. Marine's wife Tuesday, then used her compromised accounts to threaten her and at least four other military spouses and the Obama family, two spouses confirmed to NBC News. Liz Snell, whose Marine husband was deployed to Iraq or Afghanistan five times, told NBC News the FBI is investigating the hacking and online threats. Snell and at least three of the threatened spouses were quoted in a Jan. 14 CNN.com article exploring how military families reacted to the hacking of the U.S. military Central Command's social media accounts. "Ultimately, my feeling is that I don't want anyone [who follows her on social media] to feel that they are unsafe," Snell told NBC News. "I feel some level of responsibility ... This does make me nervous."