Update 5pm: At least 23 people have died and 11 others are in a critical condition after a tour bus tipped over, fell 15 meters (50ft) down a cliff and then hit a car on a serpentine mountain road, Turkish authorities say.
Deputy governor of Mugla province, Kamil Koten, told Turkey's state-run Anadolu news agency the driver is among the dead and most of those killed were women.
Governor Amir Cicek said the bus flipped over at a road bend as it was travelling from the coastal province of Izmir to Marmaris, a popular tourist destination.
Mr Cicek said the passengers were all Turkish and the cause of the accident is unclear, pending investigation.
Anadolu said the bus was in a convoy of six, carrying mostly women and children for a Mother's Day event.
Earlier: Turkish authorities say at least 20 people have died and 11 others are in a critical condition after a tour bus tipped over.
The governor of Mugla province, Amir Cicek, said the bus crashed at a road bend as it was travelling from the coastal province of Izmir to the Marmaris tourist destination.
Mr Cicek said all the passengers were Turkish.
The serpentine road, on the side of a cliff, has been closed off to traffic, causing massive congestion.
The governor says the cause of the accident is unclear and will be under investigation.