The cause of the crash remains unknown, although officials said a preliminary investigation suggested the plane may have been hit by lightning. It disappeared from radar screens in bad weather after the pilot radioed to say he would attempt an emergency landing. Aviation authorities have said the Yakovlev was air-worthy and had logged fewer than 11,000 hours of flight time in its 22 years. But they have since halted Yak-40 flights out of Tehran, IRNA said Wednesday. Iran calls for emergency meeting of OIC .
Supreme leader condemns reprisals on Afghanistan .
Khatami says UN should lead fight against terrorism . Taliban envoy . Iran says worried about influx of Afghan refugees . Iran cautions Britain over hasty US reaction to terrorist attacks . Afghan population movements high as fear builds of US strikes, UN warns .