Six Flags is keeping nine roller coasters closed as it reviews ride safety and introduces new precautions across its parks following a fatal incident earlier this month.

The amusement park operator announced Friday that it will add seat belts to Goliath at Six Flags Over Georgia and other coasters with similar restraint systems.

The changes come after Atlanta Public Schools teacher Hassan Jihad Ibn Kariem, 42, died after being ejected from Goliath on October 12. Four other riders were injured in the incident, which remains under investigation.

“Safety also depends on the dedicated teams who operate and maintain our attractions every day.…