One person has died and several others have been injured in an incident involving a rollercoaster on Monday afternoon in Georgia, according to police.
Officials did not confirm how the person died or what caused the others to be injured at Six Flags Over Georgia, about 15 miles (24km) northwest of Atlanta.
A Six Flags spokesperson said the park and local authorities responded immediately and that they are fully cooperating with local authorities as they investigate.
"We are deeply saddened by the guest incident at our park today," the spokesperson added.
Six Flags has temporarily closed nine rollercoasters, which are similar attractions, across six parks "out of an abundance of caution".
The Cobb County Police Department said detectives would investigate the circumstances of the incident.
Authorities and Six Flags did not identify the rollercoaster involved, however local TV stations showed video of passengers being evacuated from the Goliath ride.
Witnesses who spoke to WXIA of Atlanta, an affiliate of Sky's US partner network NBC News, said they saw a man fall from the Goliath rollercoaster.
"I cannot imagine the horror the patrons and employees witnessed today, and my heart aches for the family who lost a loved one," Lisa Cupid, Cobb County Board of Commissioners chairwoman, said.
"We are all grappling with how something so devastating could happen at a place that has given generations of families such happy memories," she added.
She said that next of kin have been notified.
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According to the park, the Goliath rollercoaster, which was opened in 2006, goes as fast as 70mph and reaches heights of 61m (200ft).
This death would be at least the seventh at the Georgia park, including one in 2006 in which a man had a likely heart attack on the Goliath coaster, according to the Doan Law Firm, whose practice areas include amusement park accidents.
It won't be the first time that one of Six Flags Entertainment Corporation's rides have been put under scrutiny.
Last month, Six Flags Magic Mountain, in Southern California, announced that it was retiring its famous X2 roller coaster amid lawsuits alleging serious brain injury caused by the ride.
The company operates a portfolio of 34 properties across North America, including 20 amusement parks and 14 water parks.
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