While two of them died of a heart attack, another was killed after being hit by a rock falling from the hillside yesterday, Barkot police station incharge Santosh Kumar said.
Vasundhara who hailed from Maharashtra was killed on the spot after a rock rolling down from a hill between Jankichatti and Yamunotri hit her, Kumar said.
Kamal Bai from Surat in Gujarat and Mohan Kanwar from Rajasthan died after suffering a heart attack on way to the famous temple.
Chief minister Trivendra Singh Rawat has expressed grief at the death of the three women.