Iranian President Hassan Rohani has postponed a planned state visit to Austria indefinitely, citing security reasons, the Austrian presidential office announced.
"The visit for March 30-31 by President Hassan Rouhani and his delegation has been postponed by the Iranian side for security reasons," Austrian presidency said in a statement on March 29.
It did not give further details.
A spokeswoman for Austrian President Heinz Fischer's office said it was not clear what the security reasons were.
Rohani had been scheduled to meet Fischer and other Austrian officials. The Vienna trip would have been Rohani's second official visit to Europe since Iran and world powers signed a landmark nuclear deal in July 2015.
In January, Rohani visited Italy and France, where he signed a number of major deals, including a $24 billion contract to purchase 118 Airbus planes.