The suspect held in connection with the disappearance of April Jones has been charged with abduction and murder.
46-year-old Mark Bridger was arrested on Tuesday, after April disappeared from outside her home on Monday evening.
The police and a representative from the Criminal Prosecution Service addressed the media at a press conference in Wales at 15.45 on Saturday.
Iwan Jenkins, from the CPS in Wales, said: "I now have to advise that, having carried out a detailed review of the evidence gathered so far by Dyfed-Powys Police, my conclusion is that there is sufficient evidence to charge Mark Bridger with the murder of April Jones, and that it is in the public interest to do so.
"I have also concluded that there is sufficient evidence to charge the defendant with attempting to pervert the course of justice and child abduction."
He said he will appear before Aberystwyth Magistrates' Court on Monday morning.
Chief Constable Jackie Roberts added that the investigation was "one of the most complex and fast moving inquiries in the history of our force".
She said: "Now that Mark Bridger has been charged with this horrific crime it is time to let the judicial process take its course and time to let the family come to terms with what has happened over the last week.
"In the meantime our efforts to find April will be as meticulous as they have been from the outset of this inquiry until we have exhausted all available options."