Planes scheduled to land at the airport are now being diverted.
No details of casualties have been reported so far.
Astral Aviation is a cargo airline based in Nairobi, Kenya. It was established in November 2000 and started operations in January 2001.
It operates non-scheduled and ad hoc charters to regional destinations in Africa. Its main base is Jomo Kenyatta International Airport, in Nairobi.