Investigation revealed that the captain, possibly disoriented due to bright lights from the city ahead, continued the descent well below the  clearance limit, despite being warned twice by the altitude alert system, as well as by the co-pilot, of the terrain ahead.
The investigation revealed that the captain, possibly disoriented due to the bright lights of the city ahead, continued the descent below the clearance limit despite being warned twice by the altitude alert system and the co-pilot about the terrain ahead.