Relevant text:

Hong Kong's Air Traffic Control Center reported on Mar 10th 2014 around 17:30L (09:30Z) that an airliner enroute on airway L642 reported via HF radio that they saw a large field of debris at position N9.72 E107.42 about 80nm southeast of Ho Chi Minh City, about 50nm off the south-eastern coast of Vietnam in the South China Sea and about 281nm northeast of the last known radar position. Ships have been dispatched to the reported debris field.