interpol. organization that links the world's police forces. this is an indication, really, that the chinese are absolutely dedicated to rounding up those accused or suspected of corruption. his wife has been taken into custody or police protection by the french authorities, not least because of the mysterious tweet she received after he arrived in china. said wait for my call and four minutes later had emoji of a knife on it. that's on top of threats she had over social media and directly over telephone. very sinister case in a country that executes people for corruption. it is a capital offense in china. >> just a chilling story. thanks for that, sam kiley in hong kong. a dire warning from the united nations science board.