An investigation into a bus crash that killed 12 people and left 20 injured has found the driver negligence was to blame.
The bus was carrying cruise ship passengers on an excursion to Mayan ruins in south-eastern Mexico when flipped over on a narrow road.
Seven Americans and two Swedes were among the injured, according to officials. The nationalities of the dead have yet to be established.
The investigation said the driver may have been speeding. He tried to bring the bus back onto the narrow roadway, but caused it to flip, striking a tree and other vegetation along the roadside, state prosecutor Miguel Angel Pech Cen said.
Video taken after the crash showed some survivors lying on the pavement and others walking around.
The driver, who was among 20 people injured in the accident, was in custody.
Royal Caribbean Cruises said in a statement that passengers from two of its ships, the Celebrity Equinox and Serenade of the Seas, were on the bus.
Officials said investigators were working to determine the cause of the crash, which occurred as the bus was on its way to the ruins at Chacchoben, 110 miles south of Tulum.
One child is reportedly among the dead, as was a tour guide.
The bodies were being transferred to the forensics service for identification and subsequent notification of consular authorities.