A possible oxygen cylinder blast is a main focus for investigators looking into what caused a hole mid-flight in the fuselage of a Qantas passenger jet.
Investigator Neville Blyth said a cylinder was missing from the plane but it was "too early to say whether this was the cause of the explosion".
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The plane was flying to Melbourne when it had to make an emergency landing in the Philippines on Friday.
Passengers reported a loud bang and then rapid decompression of the cabin.
'No evidence of explosives'
"At this stage, there is no evidence whatsoever that this is a security-related event," Mr Blyth, a senior investigator from the Australian Transport and Safety Bureau, told a news conference in Manila.
"This is being treated as a safety investigation."
Philippine bomb-sniffing dogs had gone through the cargo hold and found no indication of explosives, and there was no evidence of bomb residues, Mr Blyth said.
He added: "It is too early to say whether this was the cause of the explosion, but one of the cylinders which provides back-up oxygen is missing."
The initial inquiry is likely to take two to three days and a preliminary report on the findings should be released in two to three months, Mr Blyth said.
Passengers described hearing a large bang and feeling a rush of wind and debris through the cabin about an hour after Flight QF30 left Hong Kong at 0900 local time (0100 GMT) on Friday.
The Australian Transport Safety Bureau said the aircraft made an emergency descent from 29,000ft to 10,000ft before stabilising. It said initial information indicated that a section of the fuselage had separated in the area of the forward cargo compartment.
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(BBC)
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