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A Delhi-bound IndiGo flight from Goa, carrying 183 passengers and three infants on board, was forced to return and make an emergency landing at the Dabolim airport, due to low oil pressure in one of its engines, a source said. The flight -- 6E 724 -- which took off from the Dabolim airport for New Delhi at 5.50 pm, returned soon to the airport after its pilot reported the oil-pressure problem in one of the engines of the Airbus 320 aircraft, the source added.