NEW ORLEANS — A performer in Kendrick Lamar’s Super Bowl halftime show was detained on the field and could face charges after unfurling a combination Sudanese-Palestinian flag with “Sudan” and “Gaza” written on it.

The NFL confirmed the person was part of the 400-member field cast. The New Orleans Police Department said in a statement that “law enforcement is working to determine applicable charges in this incident.”

The performer stood on a car used as a prop for Lamar’s performance and held up the flag.

“The individual hid the item on his person and unveiled it late in the show,” the NFL said. “No one involved with the production was aware of the individual’s intent.”

Roc Nation, the entertainment company that produced Sunday night’s show, said the act “was neither planned nor part of the production and was never in any rehearsal.”

The show continued without interruption, and it did not seem the person was shown on the broadcast of Lamar’s performance.