The union threatened to go on strike if the doctors, who treated the woman, were not terminated from service.
According to Sukhlal Jat, a member of the nursing union, one of their colleagues, Rajbir Kaur, who was pregnant, was admitted to the hospital for a normal delivery on January 16.
During treatment, she lost her baby and was put on life support and died last night.
"Ever since her baby died, the nursing union had been protesting against the administration for not taking note of the issue and punishing the errant doctors," said the nursing union representative.
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He said that they haven't yet received a response from the AIIMS administration.
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Following the furore over the incident and threats by the nursing staff to go on strike, the premier medical institute has constituted an 8-member committee headed by the AIIMS medical superintendent to probe the matter.