grandmother among 12 dead in Mexico tour bus crash

A tourist bus carrying cruise ship passengers in Mexico killed 12 people and hurt 18 others when it flipped Tuesday. Seven Americans are among the injured and at least one American died in the crash.

The crash happened in eastern Mexico, about 40 minutes from the Costa Maya port, where the cruise ships were docked, reports CBS News' Manuel Bojorquez. Investigators are still working to determine the cause of the crash that killed a tour guide and 11 tourists – including a child and a 78-year-old grandmother from Miami.

The tour bus crashed and flipped over just after 9 a.m. more than halfway into an hour-long trip from the port to the Mayan ruins of Chacchoben. Bodies could be seen strewn along the edge of the narrow two-lane highway after the accident.

Local reports suggest the bus was traveling on the highway when it apparently drifted off the pavement. As the driver tried to get back on the road, the bus turned up on its side.