There were no reports of deaths. The official said the wounded were hospitalised for treatment.
Images circulated online showed huge flames and thick smoke billowing up into the sky.
Army spokesman Tamer al-Rifai said the explosion was the result of the "high temperature."
Temperatures in Cairo have reached into the high 90s, low 100 degrees Fahrenheit in recent days, not unusual for Cairo in the summer.
The Civil Aviation Ministry said the explosion happened outside the airport's perimeter and air traffic was undisrupted.
(This story has not been edited by Business Standard staff and is auto-generated from a syndicated feed.)