Security forces in Egypt have mistakenly killed 12 people, including Mexican tourists, during an anti-terror operation, the interior ministry says.
The tourists were travelling in four vehicles that entered a restricted zone in the Wahat area of the Western Desert, the ministry said.
Ten Mexicans and Egyptians were also injured and are being treated in a local hospital.
Mexico's President Enrique Pena Nieto condemned the incident and said he had "demanded an exhaustive investigation by the Egyptian government".
The Mexican foreign ministry confirmed that at least two of its nationals had been killed and said it was working to confirm the identities of the other victims.
In a statement, it said Mexico's ambassador in Egypt had visited the local hospital and spoken to five Mexicans who were in a stable condition.
'Mistakenly dealt with'
The statement (in Arabic) from Egypt's interior ministry said the four vehicles the tourists were travelling in were "mistakenly dealt with" during a joint military police and armed forces operation.
It said the incident happened on Sunday in an area that "was off limits to foreign tourists", but it did not give an exact location.
Egyptian officials say the tourists were in a no-go zone - and had not liaised with the authorities.
But a local tour guide has denied that, saying the group was in an unrestricted area, on top of sand dunes, trying to get a bird's eye view.
Another local source - who claims to have spoken to a driver who survived the incident - told the BBC the tourists even had a police escort.
He said the safari was organised by a local hotel which co-ordinated with the security forces.
The group of tourists was preparing to camp out in the vast Western Desert when they came under fire.
According to the interior ministry's statement, the security forces were pursuing Islamic militants in the desert, and targeted the four vehicles which were away from the main road with an Apache helicopter, which shot and hit the four vehicles.
Mexican tourists killed by Egyptian security forces - BBC News