Police have issued a European arrest warrant for the parents of a five-year-old boy with a brain tumour who they took from hospital against doctors' advice.
The Assistant Chief Constable of Hampshire police, Chris Shead, said doctors had warned them that Ashya King's condition will "start to deteriorate," adding that the youngster had a "shrinking window" of time.
He added that the European arrest warrant gave them the power to arrest the family, but officers would much prefer them to come forward.
French and Spanish doctors who may be treating the boy, were also urged to notify police.
The head of the police force which applied for a European Arrest warrant against the parents of Ashya King has now urged their release.
A British mother whose son's life was saved by proton therapy has told ITV that she defied NHS doctors' advice to pursue the treatment.
The parents of Ashya King said they took him out of a hospital to seek proton beam treatment which is not available under the NHS.