Six women inside the van were killed and 10 others also in the van were injured in the Saturday wreck outside Atlanta.
Investigators believe Monica Manire of Byron made a reckless lane change, which caused the van to flip on its side, Gwinnett County police said. She was being held in the Gwinnett County Jail.
Witnesses have told police a second vehicle unexpectedly changed lanes ahead of the van, which then went out of control, rolled onto its side and slid across two lanes of the interstate. The 2002 Dodge Ram passenger van then burst into flames.
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