Nigerian mission did not call Police. In Cairo, gatherings without permits are banned. In Egypt you can’t even travel from one part of the country without a permit to travel from the state you live . They have their own rules which they strictly enforce. https://twitter.com/toyin_abraham1/status/1317890316494688262

However, the mission will be engaging with the Authorities to see what can be done

The Egyptian police dispersed them, then traced them to a very far place. They didn’t arrest them at the mission. They came in a bus driven by an Egyptian. The driver has also been arrested. The mission will do all they can. Egypt is very very strict with their laws