 A landslide swept two buses carrying at least 60 people into a swollen river in Nepal, and continuous rain and more landslides were making rescue efforts difficult. Three survivors apparently swam to safety, but rescuers had not found any trace of the buses Friday. Heavy monsoon downpours have swollen the river, turned the water murky brown, making it even more difficult to see the wreckage. The buses were on a key highway connecting the capital to southern parts of Nepal.