悉尼新南威尔士州航空学院院长杰森·米德尔顿认为此次失事可能是由于恐怖主义或其他违规行为。但澳大利亚麦格理大学反恐怖主义专家、前军事情报局官员克莱夫·威廉姆斯对此持怀疑态度，他称最新国际刑警数据显示，截止到2013年12月13日，全球共有3900万被盗护照。“亚洲这种规模的航班上，总会有那么几个人持有假护照。想想全球有多少护照被偷或丢失，你就会明白，这可能与恐怖袭击有关，但也很可能没有关系。”

Military radar indicates that the missing Boeing 777 jet may have turned back before vanishing, Malaysia's air force chief said Sunday as authorities were investigating up to four passengers with suspicious identifications.

The revelations add to the uncertainties surrounding the final minutes of flight MH370, which was carrying 239 people when it lost contact with ground controllers somewhere between Malaysia and Vietnam after leaving Kuala Lumpur early Saturday morning for Beijing.

A massive international sea search has so far turned up no trace of the plane, which lost contact with the ground when the weather was fine, the plane was already cruising and the pilots didn't send a distress signal - unusual circumstance for a modern jetliner operated by a professional airline to crash.

Vietnamese air force jets spotted two large oil slicks Saturday, but it was unclear if they were linked to the missing plane, and no debris was found nearby.

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