New US Secretary of State John Kerry has attended a gathering of nations in Rome who support the Syria opposition.
Foreign Secretary William Hague joined Mr Kerry as they met leaders of the Friends of Syria group.
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The man was taken early this morning to a south London police station where he remains in custody.
The Chancellor faces tough talks to build a Government while also dealing with the challenge from a resurgent far right.
Watch John McDonnell's speech at Labour Party conference 2017 live as he speaks to Brighton the audience from 12.15pm.