A Royal Navy warship on which Prince William is serving has seized cocaine worth at least 40 million pounds in a major drugs bust, the Ministry of Defence said on Wednesday.

The frigate HMS Iron Duke intercepted an ocean-going speedboat on Saturday several hundred miles northeast of Barbados in a joint operation with the United States Coast Guard, the Ministry said.

U.S. Coast Guards boarded the speedboat, seized 45 bales of cocaine, weighing a total of 900 kg (1,984 lb), and arrested the five-man crew. The drugs were then transferred to HMS Iron Duke.

William is on a two-month attachment with the Royal Navy until August 1.