SYDNEY, Dec 3 ― Australian authorities hunting for Malaysia Airlines Flight 370 said they have narrowed down the most likely search area for the missing plane, as they seek to solve one of the biggest mysteries in modern aviation history. 

Three quarters of a new “hot spot” area within the current search zone have been scoured, Australia’s Deputy Prime Minister Warren Truss told reporters in Canberra today.

The Australian Transport Safety Bureau said earlier today that new analysis has reaffirmed “the highest probability of the resting place of the aircraft in the current 120,000 square kilometer search zone.”

Investigators have fruitlessly trawled through more than 70,000 square kilometres (27,000 square miles) of sea bed underneath the southern Indian Ocean. The only solid evidence so far from Malaysia Airlines’ missing Boeing Co 777 has been a wing component that washed up in July on Reunion Island ― 3,800 kilometres from the current search zone.

Flight 370 was en route to Beijing from Kuala Lumpur in March 2014 with 239 people on board when it disappeared. Investigators have concluded that someone on board intentionally disabled the aircraft’s tracking devices. ― Bloomberg