UPDATE at 7:20 a.m.: All lanes are now open on I-75, Chattanooga police say.
Police say six people have been killed in a nine-vehicle wreck on Interstate 75.
Chattanooga Police Department spokesman Kyle Miller says the accident happened around 7:10 p.m. Thursday on I-75 northbound near the suburb of Ooltewah.
He says investigators are working to determine the cause of the crash.
Police believe more than 15 people were involved; the exact number is still being determined because multiple groups were taken to local hospitals.
The identities of the victims were not immediately released.
Northbound lanes of I-75 were shut down after the accident and traffic was redirected.
Anyone with information on the crash can call reporter Shelly Bradbury at 423-757-6525.