Please answer a question about the following article about Nigeria:

Nigeria in recent years has been embracing industrialisation. It currently has an indigenous vehicle manufacturing company, Innoson Motors, which manufactures Rapid Transit Buses, Trucks and SUVs with an upcoming introduction of Cars. Nigeria also has few Electronic manufacturers like Zinox, the first Branded Nigerian Computer and Electronic gadgets (like tablet PCs) manufacturers. In 2013, Nigeria introduced a policy regarding import duty on vehicles to encourage local manufacturing companies in the country. In this regard, some foreign vehicle manufacturing companies like Nissan have made known their plans to have manufacturing plants in Nigeria. Ogun is considered to be the current Nigeria's industrial hub, as most factories are located in Ogun and more companies are moving there, followed by Lagos.

What city is Nigeria's secondary industrial area?
Lagos