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Eight Americans, including an 11-year-old boy, are among the 12 people who died after a tour bus crashed in Mexico Tuesday, according to the Quintana Roo attorney general’s office.

Two of the other fatalities were Swedes, one was Canadian and one was Mexican, according to the tourism ministry of the Mexican state of Quintana Roo, where the crash occurred.

Over a dozen people were injured, including seven Americans, officials said. Tourists from Brazil, Canada and Sweden were also injured.

Quintana Roo state prosecutor Miguel Angel Pech Cen said the preliminary investigation indicates the bus driver was negligent and possibly speeding, causing him to lose control and leave the road, The Associated Press reported. He then tried to get back on the narrow path before flipping and hitting a tree, according to the AP.

The public prosecutor’s office has opened an investigation into the possible crimes of homicide, injury and damage, the Quintana Roo attorney general’s office said.

The bus driver was “transferred to Chetumal to receive medical care, but could not be detained at this time but he will be required for the investigations,” the Quintana Roo attorney general’s office said in a statement translated from Spanish.

Brazilian Vítor Maciel Fontes Jacques, 32, was among the passengers.

"There were dead people. We saw some people that were still tied to their seat belt," he said.

He said he broke his collarbone and a family member suffered a head injury.

U.S. resident Carrie Vanrenterghem, who traveled with her two daughters on the same tour but on a bus directly in front of the one that crashed, said she saw the bus being towed away on their way back from the Mayan ruins.

One side of the bus was "smashed" and the "whole windshield was gone,” Vanrenterghem said.

"You could tell that somebody had probably gone ... through the windshield," she said, describing the scene as a "hard" sight to see.

"It could have been us that could have been on that bus," Vanrenterghem said. "My prayers are for these families."

Guests from two cruise ships were on the tour bus, Royal Caribbean said. The cruise ships -- the Celebrity Equinox and Serenade of the Seas -- both left Florida several days ago.

"Our hearts go out to all those involved," Royal Caribbean spokesman Owen Torres said. "We are doing all we can to care for our guests, including assisting with medical care and transportation."