LONDON - The U.K. Ministry of Defence says Prince William took part in a British navy helicopter raid that opened fire on a speedboat believed to be used by drug runners.

It was the second time that the prince helped his crew mates on the HMS Iron Duke go after suspected narcotics traffickers in the Caribbean.

A military spokesman says the Iron Duke intercepted the speedboat on July 18th about 175 kilometres north of Venezuela's and Colombia's coastlines.

William was the lookout on the Lynx helicopter deployed to track the boat as marksmen shot out the vessel's engine.

The military says three Colombians were arrested when the HMS Iron Duke, the British frigate from where the helicopter operates, caught up with the speedboat.

But while traces of cocaine were detected on two of the three, no drugs were found aboard.