The original evacuation plans had not called for a large-scale helicopter operation at the United States Embassy, Saigon. Helicopters and buses were to shuttle people from the embassy to the DAO Compound. However, in the course of the evacuation it turned out that a few thousand people were stranded at the embassy, including many Vietnamese. Additional Vietnamese civilians gathered outside the embassy and scaled the walls, hoping to claim refugee status. Thunderstorms increased the difficulty of helicopter operations. Nevertheless, the evacuation from the embassy continued more or less unbroken throughout the evening and night.