The Tuesday report said a bus flipped over on the highway the evening before as it traveled between the Atlantic coast tourist destinations of Essaouira and Agadir in the south of the country.
That crash killed 17 people; the Dutch and German foreign ministries confirmed their citizens were among the dead.
Earlier on Monday, a bus speeding on mountainous roads along the Mediterranean crashed outside the city of Nador, killing 10 people and wounding 33. The dead included three women and a young girl.
According to the U.S. State Department website, traffic accidents are a "significant hazard" in Morocco.