Witnesses last night reported the blast after hearing a loud noise, and images of flames and smoke were shared on social media.
Security sources said the 12 injured people were taken to hospital for treatment.
The area was cordoned off by a strong police presence, according to an AFP correspondent on site, who said fire engines and emergency vehicles were sent to fight the flames and help the wounded.
The Department of Civil Aviation denied that the explosion took place inside the airport, as indicated by some witnesses.
"Departing and arriving flights are not affected," he added.
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