Fifty-six-year-old Martha Farrell was to return to India from Afghanistan on Saturday but she died in an attack on a Kabul guesthouse in which four Indians were killed."She was the spokesperson for a training programme conducted by the Aga Khan Trust. She was in Afghanistan from May 9 and was to come back on May 16," an official from Participatory Research in Asia (PRIA) told IANS.Established in 1982, PRIA is an international centre for learning and promotion of citizen participation and democratic governance. It offers professional expertise and practical insights which are utilised by other civil society groups, NGOs, governments, donors, trade unions, private business and academic institutions.The Taliban has claimed responsibility for the attack on the Park Palace guesthouse in Kabul on Wednesday night.