Two people were killed and 10 others injured when the dome of a mosque under construction collapsed in the western Turkish city of Usak on Saturday, a local official said.
The cause of the collapse was not immediately known, Anatolia news agency quoted the city's deputy governor, Mustafa Guney, as saying.
The casualties included the 83-year-old architect of the mosque, he added.
In early February, an 11-storey apartment block collapsed in the central Turkish city of Konya, killing 92 people. Authorities blamed the tragedy on shoddy construction.