Seven cruise ship passengers have been arrested after 24 pounds of cocaine were found on board Royal Caribbean’s Jewel of the Seas just before it was to set off on a cruise from Puerto Rico. US Customs and Border Protection said that a dog doing cabin inspections aboard the ship on Sunday found the drugs worth around US $300,000.

The CBP canine alerted its handlers to a piece of luggage in one of the cabins. When they opened the suitcase, 10 packages were found that subsequently tested positive to the properties of cocaine. Royal Caribbean spokeswoman Cynthia Martinez said six of the arrested were US male passengers. The identity of the seventh was not immediately clear. Royal Caribbean is cooperating with authorities. The ship departed San Juan on Sunday for an eight-day trip.