All schools in Nigeria have been ordered to remain shut until 13 October as part of measures to prevent the spread of the deadly Ebola virus. The new academic year was due to start on Monday.
But the education minister ordered the closures to allow staff to be trained on how to handle suspected Ebola cases.
Five people have died of Ebola in Nigeria. The West Africa outbreak has centred on Guinea, Liberia and Sierra Leone, killing more than 1,400 people.
It is the largest ever outbreak and has infected an estimated 2,615 people. About half of those infected have died. The virus is spread between humans through direct contact with infected bodily fluids. There is no cure for Ebola but with intensive care treatment and proper hydration, patients have a chance of survival. It spread to Nigeria - Africa's most populous country - in July, when a person infected with Ebola flew from Liberia to Lagos.