PERTH, Australia - A robotic submarine looking for the missing Malaysia Airlines jet is expected to finish searching a patch of the Indian Ocean seabed within a week after so far coming up empty.
Officials say the search area may be expanded after that.
The U.S. Navy's Bluefin 21 unmanned sub has covered around 51 square miles since it began diving into the depths on Monday. The latest data are being analyzed, but nothing has yet been identified.
Malaysia's defense minister says the weekend search is crucial.
A new day of searching has begun.
Up to 11 aircraft and 12 ships continue to scan the ocean surface for debris from the Boeing 777 that disappeared March 8 en route from Kuala Lumpur to Beijing with 239 people on board.