Five-year-old April Jones vanished from her home town Machynlleth in Wales 10 weeks ago and the little girl has not been seen since.
Police are continuing their painstaking search for the missing schoolgirl who was last seen getting into a vehicle near her home.
More top news
Satoshi Uematsu, 26, was sent to the Yokohama District Public Prosecutors Office in Kanagawa prefecture.
West Yorkshire Police confirmed a 32-year-old woman was taken into custody in connection with the alleged threats.
Five women shared their views about whether Hillary Clinton's Democratic presidential nomination is a defining moment in US history.