A big blast in the Nigerian city of Ibadan killed two people and hurt 77 others last night. Rescue and recovery work is still happening in seven neighborhoods of Nigeria's third biggest city. The reason for the explosion is not known yet, but the officials think it could have been caused by mining explosives that were kept in a house. Pictures show buildings almost completely destroyed and vehicles ruined by explosions. People posted scary videos on social media. One person saw a mall being destroyed in Bodija, a neighborhood in the city. A big noise woke us up at 07:30 in the evening. "Domino's Pizza and Ace Mall in Bodija got destroyed," he said. The police said they will look into the explosion quickly. "The security agencies found out that illegal miners were living in a house in Bodija and had kept explosive devices there, which caused the explosion," said the regional governor Seyi Makinde.