3:52 PM PT -- Check out this video of Tevin in custody in Georgia ... he's handcuffed in an orange jumpsuit as he's being escorted down a hallway in the Liberty County Jail.
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9:06 AM PT -- TMZ has obtained the 911 call placed from the Airbnb the night of the shooting at 11:43 PM on December 31. The frantic caller said an argument broke out and then "they just started shooting."
He added he did not see who the shooter was but, when asked if anyone is bleeding, he says, "They're both dead."
Olympic gymnast Simone Biles' older brother is in police custody for the murders of 3 people ... after an 8-month investigation into a New Year's Eve tragedy.
Tevin Biles-Thomas was arrested Thursday at Fort Stewart in Georgia, where he is an active duty soldier in the Army. Police say Biles-Thomas opened fired on a group of people when a fight broke out during a New Year's Eve party at an Airbnb in Cleveland.
According to cops, an "uninvited" group of people had entered the house party and during the ensuing brawl ... Biles-Thomas fired the shots that killed three men and injured 2 others.
A Cuyahoga County Grand Jury returned an indictment of Biles-Thomas for 6 counts of murder, 3 counts of voluntary manslaughter, 5 counts of felonious assault and 1 count of perjury. Under Ohio law, "purposely killing" and "knowingly killing" a victim are separate counts for each victim -- and that's why he got 6 murder charges.
Simone and her family are from the Columbus, Ohio area.
24-year-old Biles-Thomas is still being held in Georgia, but will be extradited to Ohio ahead of his arraignment on Sept. 13.