Ashya King's parents said they wanted the "best treatment" for their son as they were taken by police from the court in Velez-Malaga to a police car this evening.
Brett King could be seen saying: "We just want the best for Ashya." His wife Naghemeh can be heard saying that the couple want the "best treatment" for their son.
Both appeared to be handcuffed and police pushed them into the car.
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.