NEW ORLEANS — A performer who was part of Kendrick Lamar’s Super Bowl halftime show was detained by security after waving the Sudanese flag and Palestinian flag together with the words “Sudan” and “Gaza” written on them toward the end of the performance, the NFL said.

Are you going to be a coward?” Zül-Qarnain Nantambu asked himself before taking the field for Kendrick Lamar’s show. “Are you going to take a stand?”

No one involved with the production was aware of the individual’s intent,” the N.F.L. said in a statement about the protest during Kendrick Lamar’s show.