Six Flags has temporarily closed nine rides at six of its amusement parks after a man died Monday when he fell from the Goliath roller coaster at Six Flags Over Georgia in the Atlanta area.

The company said the closures were ordered out of “an abundance of caution” as investigators work to determine what caused the fatal incident. Six Flags did not identify all nine rides affected, although the Nitro roller coaster at Six Flags Great Adventure in New Jersey was among those reported to be closed. “The safety of our guests and team members remains one of our highest priorities,” a Six Flags spokesperson said.

Police identified the victim as Hassan Jihad Ibn Kariem, 42, of Atlanta. A witness reported seeing Kariem come out of his seat while riding Goliath, a massive coaster that reaches speeds of approximately 70 miles per hour and heights of 200 feet. Police said several other people were injured in the incident.

Nick Mendenhall, who rode the coaster with his teenage son just minutes before the fatal incident, described the scene as surreal. “Everything felt like it was happening in slow motion,” Mendenhall said.

Six Flags said it was “deeply saddened” by the death and is cooperating fully with investigators. Six Flags Over Georgia was closed Tuesday for a regularly scheduled non-operating day.

The investigation remains ongoing. Brian Avery, a legal and risk professor at the University of Florida, said investigators will likely examine surveillance footage, maintenance records and statements from witnesses and ride attendants to determine what happened. “All of these are clues to kind of build to the root cause and trying to come to an actual understanding as to why this would have occurred,” Avery said. Although roller coaster accidents are relatively rare, Avery argued that the incident highlights the need for consistent safety standards across amusement parks nationwide.

The latest closures come roughly two weeks after Six Flags permanently shut down its X2 roller coaster at Six Flags Magic Mountain in Southern California. The decision followed multiple lawsuits alleging the ride caused serious brain injuries. The company declined to comment on the pending litigation.

Investigators have not announced a cause for Monday’s fatal fall, and it remains unclear when the temporarily closed rides will reopen.