Customers at a Chili’s outlet in North Carolina reportedly suffered chemical burns after drinking margaritas that were allegedly made with a cleaning agent, according to the available report.

The incident took place at the restaurant in North Carolina, where cocktails were served to customers before the problem was discovered. The exact cause and how the cleaning agent was used are not yet clear.

No further details were immediately available on the number of affected customers or the extent of their injuries. The matter appears to be under investigation.