International Paper, a longtime pillar of Coastal Georgia's economy, announced Thursday that it will permanently close its Savannah and Riceboro plants by the end of September and cut some 1,100 hourly and salaried jobs.

International Paper Co. has announced the closure of two Georgia paper mills, including a Savannah mill that's been a key part of the local economy for 90 years

International Paper announced Thursday it will close the Riceboro containerboard mill and Riceboro Timber and Lumber. The company also announced the closure of the Savannah containerboard mill and the Savannah packaging facility.