The parents of Ashya King will face no further action and should be reunited with their son, say prosecutors. The Crown Prosecution Service has withdrawn a European arrest warrant enabling Spanish police to detain Brett and Naghemeh King. Prime Minister David Cameron welcomed the moves to reunite the family. Mr and Mrs King were arrested in Spain on Saturday, after taking their son out of hospital in Southampton last week against medical advice. A CPS spokesman said it had "urgently reviewed the case" and found "insufficient evidence for a realistic prospect of conviction for any criminal offence". "We have therefore decided to stop the criminal proceedings," he added. In a tweet, Mr Cameron said: "I welcome the prosecution against #AshyaKing's parents being dropped. "It's important this little boy gets treatment & the love of his family."