A British man and his eight-year-old daughter died in a crash in Turkey.
Jonathon Pearce and his daughter, who are from the West Midlands, were on a Jeep safari trip when they were killed.
A Foreign Office spokeswoman said: "We can confirm that two British nationals died and seven were injured in a road traffic accident whilst on a Jeep safari in Turkey yesterday."
Among those injured was Mr Pearce's eight-year-old nephew, who is in a "critical but stable condition".
The spokeswoman said: "We understand the driver of the Jeep they were in is being detained."
The other people injured were also members of the same extended family, except for one other British person.
They suffered minor injuries, she said.
The family, who were part of a larger group excursion, are receiving consular advice while local police investigate the incident, which took place near Dalyan. The Foreign Office could not confirm reports that the family is from Birmingham. Mr Pearce and his daughter had been holidaying with First Choice, who were not the organisers of the safari trip.
A spokeswoman said: "First Choice regrets to confirm that two of its customers, an eight-year-old girl and her father, were tragically killed and a third customer is in critical condition, following a Jeep accident in Turkey.
"We would like to express our heartfelt sympathy to family and friends during this deeply sad time."
The Mail Online reported that the incident occurred when the driver of an open-top 4x4, in which the victims were travelling, was squirted in the eyes with a water pistol and lost control, hitting a tractor.
The spokeswoman said: "At this stage, we are unable to confirm exact details of the accident, however we can confirm that the customers were on a Jeep safari organised by a third party not affiliated with First Choice."
Resort staff were offering support and assistance to the family, she said.