The reports of the latest assault came two days before India was due to mark the first anniversary of the death of a student who was gangraped on a bus in an attack that shocked the nation.
The woman who was assaulted on Christmas Eve told police she was abducted by three men while sightseeing with friends in Karaikal, a port city in Puducherry, the Times of India newspaper and TV networks reported.
One of the men raped her at a secluded spot before freeing her, the Times said.
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