After a goalless first half, Toko Ekambi opened the scoring for Cameroon 11 minutes after the break, but Ablie Jallow cancelled the lead in the 72nd minute.
Nigeria will face the runners-up of Group C – either Guinea or Senegal – on Saturday.
The windows of the bus were also shattered.
Guinea Football Federation media manager Amadou Makadji said six people were confirmed dead in the celebrations.
“I want to make it clear that representing my nation is an honour.’’
Guinea and Gambia will face each other in their second Group C game later today.
The Eagles will meet Guinea Bissau on Monday in their last group match at the Stade Félix Houphouët-Boigny.
“The Super Eagles need to increase the tempo and even do more. We know the national team can do better,” said a football administrator.
Super Eagles beat hosts Côte d’Ivoire 1-0 for Nigeria to get back on track at the ongoing 2023 AFCON.
The Eagles defeated their Ivorian counterparts 2-1 in the quarter-final of the 2013 AFCON in South Africa.
