LONDON -- A critically ill 5-year-old boy who was taken out of a British hospital against doctors' advice has been found in Spain, police said Saturday.

An international search began Thursday for Ashya King, who has a severe brain tumour, after his parents removed him from a hospital in the southern English city of Southampton for unknown reasons.

British police said earlier that a European arrest warrant was issued for the boy's parents, Brett and Naghemeh, both Jehovah's Witnesses. The family had last been seen travelling on a ferry to France.

Police said late Saturday that officers are questioning the couple, and are "waiting to hear on Ashya's condition." They did not specify where in Spain the family was found.