 A number of civilian aircraft have infringed into these areas, and the Tanzania Civil Aviation Authority has advised pilots to keep away at all times.A report published in 1996 by the Tanzania Accident Investigation Branch recommended that the prohibited area (HTP6) ought to be modified in order to facilitate easier access to towns west of Dar es Salaam.It also stated that civilian aircraft were able to fly over it upon request to Ngerengere Tower, contrary to its designation as a civilian no-fly zone.