Most of the casualties were children.

The incident took place at a local polo club, where the nearby Kings Assembly Church had organized a gift donation drive, according to Olufemi Ayodele, a regional spokesman for Nigeria's Civil Defense Corps.

"During the process of distributing the gift items, there was a stampede due to overcrowding," he said. "Casualties were children mostly."

The drive had not yet started when the stampede took place, said Grace Woyengikuro Iringe-Koko, a spokeswoman for the state police. Woyengikuro Iringe-Koko said the crowd forced their way into the venue, despite the fact that the gate was closed, resulting in the deadly charge.

CNN's Manveena Suri contributed to this report