Desperate search for 2 sisters missing from Austin, Texas

Police believe the sisters were taken against their will, and an Amber Alert went out after their mother was found dead in their home.
1:22 | 01/02/18

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Transcript for Desperate search for 2 sisters missing from Austin, Texas
here to the desperate search for two sisters missing from outside Austin, Texas, an amber alert going out for a 7-year-old and a 14-year-old after their mother was found dead in their home. Police believe they may be a man who lived in that home, and ABC's Marcus Moore is in Texas tonight. Reporter: Tonight, the FBI assisting Texas police in their urgent search for two little girls believed to be with this man, 44-year-old Terry Allen miles. Our concern and our focus is bringing these two girls home safe. Reporter: 7 year-old lulu bandera-margaret and her 14 year-old sister Lili Griffith, missing after their mother Tonya bates was found dead new year's eve in their Round Rock home outside Austin. Indications at that time is that it was a suspicious nature. Reporter: Police say they were called to the family home twice on Saturday when a coworker and boyfriend suspected something was wrong. On Sunday, they found bates' body. The girls, gone. We believe they are not with Terry Allen miles willingly. Reporter: Texas authorities asking for the public's help tonight, issuing an amber alert for the girls, who are believed to be with miles, their mother's roommate. Police releasing this picture of the car they may be traveling in. Police say they are investigating possible sightings in New Mexico and Colorado. David, as authorities search the roadways for that car, police in Louisiana tell ABC news that back in 2011, miles was charged with attempted murder in the beating of his then-girlfriend. David? Marcus, thank you.

This transcript has been automatically generated and may not be 100% accurate.

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