These suspects being accused of the Murder of Mr Mabhouh can clearly indentified so let Interpol carry out an arrest warrant for them. They can be questioned and if they have nothing to fear the should be cleared. When a state goes down the road of murder without a trial they become murders and leave themselves open for retaliation of there own civilians. As for using another nation passports to carry this act shows a total lack of respect to that nation.
Spain investigating ex-IMF chief Rato for fraud (Reuters)
from the article: Report: German passport tied to Dubai hit wasn`t forged