COBB COUNTY, Ga. - Southbound lanes of Interstate 75 near Terrell Mill Road were completely shut down Friday afternoon due to active police activity, according to the Georgia Department of Transportation.

What we know:

GDOT’s 511 system shows traffic backed up for several miles as drivers stack up approaching the closure. A live camera feed from the agency shows multiple fire trucks and police vehicles blocking all southbound lanes.

The Express Lanes, which run adjacent to the southbound lanes, have also been shut down.

What we don't know:

There are multiple reports of an explosive device at the scene.

Officials have not said what prompted the police activity or whether anyone has been detained or injured.

It’s also unclear how long the interstate will remain closed and what route

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