Vallipuram Parvathi travelled from Malaysia to the southern Indian state of Tamil Nadu on Friday night, but was prevented from leaving the aircraft, the Indian news agency said, giving no details.
The pro-rebel Tamilnet website also reported the incident, saying she was "refused landing by Indian immigration officials.
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The wheelchair-bound Parvathi was to be admitted to a hospital in Chennai, capital of Tamil Nadu which shares close cultural links with Sri Lanka's minority Tamils.
Parvathi, who is believed to be in her early 80s, was seeking treatment because she had suffered a stroke, a Tamil politician in Colombo told AFP, asking not to be named.
There was no immediate comment from Indian government officials.
Tamilnet reported that she had been sent back to Malaysia and that she had been denied landing by Indian immigration officials as she was considered "a threat to law and order in the state.
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Police stepped up security around Chennai airport to prevent any disturbanc