TUSCALOOSA, Alabama (AP) — Authorities in the U.S. have arrested a 19-year-old woman they say tried to have someone she met on Facebook kill her family.

But the person she was talking with over the social media site was actually her aunt.

Al.com reports that Marissa Williams was arrested Monday and charged with solicitation of murder. She was being held in the Tuscaloosa County jail in Alabama on $30,000 bond. It wasn't immediately clear if she had a lawyer.

After being blocked from seeing her niece's Facebook profile, Williams' aunt told investigators she created a new Facebook profile for a fake man. Williams began chatting with the fictional man, not knowing who it really was.

The aunt contacted authorities after Williams talked about how the man could kill family members.

The aunt told authorities she had hoped to get an idea of her niece's online activity and wanted to teach Williams the potential dangers of meeting strangers online.

When she was interviewed by deputies, Williams admitted to the plot but said she didn't really mean for anyone to be killed.