Malaysian Police Chief: MH370 Investigation 'May Go On and On and On'
The Bluefin 21, the Artemis autonomous underwater vehicle (AUV), is hoisted back on board the Australian Defence Vessel Ocean Shield after a successful buoyancy test in the southern Indian Ocean as part of the continuing search for the missing Malaysia Airlines plane, April 4, 2014.
Flight Lieutenant Stephen Graham monitors a TAC station onboard a Royal New Zealand Air Force P3 Orion during search operations for wreckage and debris of missing Malaysia Airlines Flight MH370 in the southern Indian Ocean, near the coast of Western Australia, April 4, 2014.
Japan's Maritime Self-Defense Force Commander Hidetsugu Iwamasa speaks to the press in front of one of their P-3C Orion aircraft currently at RAAF Base Pearce near Perth, Australia, April 4, 2014.
Relatives of Chinese passengers on board the Malaysia Airlines Flight MH370 pray in a prayer room, Beijing, China, April 4, 2014.
Australia's Prime Minister Tony Abbott and Malaysia's Prime Minister Najib Razak tour RAAF Base Pearce, near Perth, April 3, 2014.
Steve Wang a representative from the committee for relatives of Chinese passengers onboard Flight MH370 talks to journalists after a closed door meeting with Malaysian officials via teleconference in Beijing, April 2, 2014.
A crew member sits in the cockpit of a Royal New Zealand Air Force patrol aircraft as it continues searching in the southern Indian Ocean for Flight MH370, April 1, 2014.
Koji Kubota of the Japan Coast Guard keeps watch while flying in the search zone for debris from Flight MH370, April 1, 2014.
A Buddhist monk welcomes Chinese relatives of passengers on Flight MH370 as they arrive to pray at a Buddhist temple in Petaling Jaya, Malaysia, March 31, 2014.
Australian Prime Minister Tony Abbott addresses the international forces currently based in Perth searching for Flight MH370 during his visit to RAAF Base Pearce, March 31, 2014.
The Search for Flight MH370
Malaysia's national police chief is warning that authorities may never learn what exactly led to the disappearance of Malaysia Airlines Flight 370.
The comments on Wednesday came 25 days after the Boeing 777 vanished en route from Kuala Lumpur to Beijing, with 239 people on board.
An international search for debris in the southern Indian Ocean and a criminal investigation by Malaysian police have so far proven fruitless.
Inspector General Khalid Abu Bakar said investigators still need more time to search for clues, warning the probe "may go on and on and on."
Khalid said police continue to focus on the possibilities of hijacking, sabotage, and personal or psychological problems of those on board.
He said investigators have conducted 170 interviews and that more statements need to be collected.
Malaysian officials have said they believe someone intentionally diverted the plane before it crashed into the remote and treacherous waters off the northwest coast of Australia.
The search for possible wreckage continued Wednesday, with ten aircraft and nine ships joining the effort. Australian maritime officials said visibility was favorable, unlike in recent days, when bad weather forced the search to be suspended.
Australian Prime Minister Tony Abbott said his country is committed to finding out what happened to the plane.
"It's one of the great mysteries of our time. It's a terrible tragedy. There are 239 devastated families. There are a lot of very concerned people right around the world and Australia is leading the search and recovery effort as is right given that it all happened in our search and rescue zone. We owe it to the world, we owe it to those families to do whatever we reasonably can to get to the bottom of this," said Abbott.
The search is also expanding underwater, with the arrival of the British Royal Navy nuclear submarine HMS Tireless. It is the first submarine to join the mission.
Time is running out to detect the signal from the missing plane's flight recorder, or black box, which is powered by a battery that usually lasts only 30 days.