A Tupolev 154M passenger plane, operated by Taban Air, was destroyed in an accident at Mashhad Airport (MHD), Iran. There were 157 passengers and 13 crew members on board. Some 46 passengers were injured. Taban Air flight 6437 originated in Abadan Airport (ABD) and diverted to Isfahan (IFN) because of poor weather at Mashhad Airport (MHD). When weather conditions had improved, the flight left Isfahan at 05:35. En route the visibility deteriorated again, forcing the crew to enter a holding pattern. While waiting for the fog to clear, one of the passengers became seriously ill. Despite the limited visibility, the captain declared a medical emergency and attempted to land at Mashhad. During the landing the tail struck the ground. The right wing also struck the ground as the airplane veered off the runway. The undercarriage collapsed and a fire erupted. Weather reported about the time of the accident was: OIMM 240330Z 00000KT 0300 FG VV003 02/02 Q1021 A3015= OIMM 240400Z 00000KT 0200 FG VV002 02/02 Q1021 A3017= OIMM 240350Z 00000KT 0200 FG VV002 02/02 Q1021 A3017=