Below is the revised report on the incident on the Aviation Herald Website:
Turns out that it was a false fire warning:
Accident: Air Zimbabwe B732 at Lubumbashi on Jan 25th 2009, engine fire
By Simon Hradecky, created Sunday, Jan 25th 2009 19:13Z, last updated Monday, Jan 26th 2009 21:18Z
An Air Zimbabwe Boeing 737-200, scheduled passenger flight from Lubumbashi to Kinshasa (Democratic Republic of Congo) with 50 passengers, returned to Lubumbashi after sensors indicated the right engine on fire about 15 minutes into the flight. The crew shut the engine down, deployed the passenger oxygen masks and managed a safe landing still on active fire alert 30 minutes after departure, all passengers and crew could be evacuated without injuries.
Engineers subsequently established nothing wrong with the engine, no traces of fire were detected.
The airplane is currently grounded due to necessary replacement of oxygen supplies.
Initial reports from the airport had said, that the airplane landed with the engine on fire, the passengers and crew were evacuated. The fire was extinguished by emergency services receiving the airplane on the ground. The airplane was reported to have received substantial damage.
Air Zimbabwe denied those claims and reported, that it was a false fire alarm, the airplane now being grounded because of used up oxygen supplies for both crew and passengers, so that about 200 oxygen supplies need to be flown in.