New Delhi, Sept. 21 -- Shankar, the 29-year-old African elephant at the Delhi Zoo, died of "acute cardiac failure", as per preliminary post-mortem findings. Zoo officials said that the final post-mortem report is awaited. The zoo's lone African elephant had died late on Wednesday evening after collapsing in its shed. "The preliminary opinion after the post-mortem is..death due to acute cardiac failure. The cause of acute heart failure is to be ascertained from lab reports, which is awaited from the Indian Veterinary Research Institute (IVRI), Bareilly," the zoo's official statement read. Further, an investigation at the director level and by the Union Environment Ministry is underway, zoo officials said.

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