VIDEO: At least 12 killed, 18 injured as tourist bus crashes in Mexico

MEXICO CITY — At least 12 people died when a bus carrying cruise ship passengers flipped over on a highway in the southeastern part of Yucatan Peninsula early Tuesday, officials said.

Quintana Roo state Civil Defense spokesman Vicente Martin said. Eighteen people, including seven Americans and two Swedes, were injured and transferred to four hospitals, and five of those passengers have been discharged.

The bus, which belonged to Costa Maya Port, crashed at Kilometer 5 of the Mahahual-Cafetal highway.

Video images from the scene showed the bus on its side in vegetation off the two-lane highway, with some survivors lying on the pavement and others walking around.

Miami-based Royal Caribbean Cruises tweeted that guests from two of its ships, the Celebrity Equinox and Serenade of the Seas, were involved in the crash. The company expressed its sympathies and said it was assisting with medical care and transportation.

A tour guide and driver were among those on board, the Costa Maya port said in a statement.