Iran to join Syria war talks in Vienna
The US is intensifying diplomatic efforts to end the "hell" of Syria's civil war even as it increases support for moderate rebels, US Secretary of State John Kerry has said.
Mr Kerry is travelling to Vienna for talks with foreign ministers on ending the four-and-a-half year conflict.
Iran is for the first time taking part in such talks, which will also include Russia, Saudi Arabia and Turkey.
Elaine Jung reports.