Conflicting report from Reuters:
“Malaysian Transport Minister Hishamuddin Hussein said authorities were also checking the identities of two other passengers, other than the men on the Austrian and Italian passports. Azharuddin Abdul Rahman, the head of the department of civil aviation, later told reporters only two passengers were being investigated”.
http://www.reuters.com/article/2014/03/09/us-malaysiaairlines-flight-idUSBREA2701720140309
Key phrase (imho) in link and seems to be repeating in other reports ... </I>Hishamuddin, who is also defense minister. “I have indicated to our intelligence agencies and I have also spoken to international intelligence agencies for assistance.”</I>
Some reports are saying the next two are the Ukrainians.