Icon of the Seas: World's largest cruise ship sets sail from Miami

The world's largest cruise ship has set sail from Miami, Florida, on its maiden voyage, but there are concerns about the vessel's methane emissions.

The 365m-long (1,197 ft) Icon of the Seas has 20 decks and can house a maximum of 7,600 passengers. It is owned by Royal Caribbean Group.

The vessel is going on a seven-day island-hopping voyage in the Caribbean.

Environmentalists have warned the liquefied natural gas-powered ship will leak harmful methane into the air.