The sponge-wrapped skulls were packed in separate boxes and labeled as handicrafts, said Mr Eko Darmanto, chief of customs at Jakarta's airport. Two were intricately carved or decorated and the third remained in its original form.

'Police are investigating a possible crime,' he told reporters, adding that the skulls originated from Bali island and were destined for Yorkshire via air courier.

Indonesia's criminal code says anyone who intentionally digs or moves human remains from a grave for sale or collection faces up to 14 months in jail. -- AP