In November, Johnson gave a detailed description of how Moore allegedly molested her in his office in Gagsden in the 1990s when she went to him for his legal expertise during a custody battle over her son.
AL.com reports that Johnson's neighbors noticed a suspicious man walking around the house on Tuesday before it caught on fire. While no one was hurt ― Johnson, her husband and her grandchild were all out of the house at the time ― the family lost all their possessions in the blaze.
Natalie Barton, a public information officer with the Etowah County Sheriff's Department, told Al.com the fire "is still under investigation by the Etowah County Arson Task Force".
She alleges that at the age of 28 Moore groped her and made comments about her young daughters' physical appearance. "I want people to know that it's OK to finally say something", she told AL.com of her reasoning for going public with her story.
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Five other women have accused Moore of sexual misconduct or of dating them when he was in his 30s and they were teenagers.
"We have just the clothes on our backs", she told the website. "More details will be released when warrants are obtained".
Doug Jones became the first Democrat sent to the Senate from Republican stronghold Alabama in a quarter century.
Reuters was unable to independently verify the allegations, and Moore has denied any wrongdoing.
"I was so humiliated and sickened", she said.