US Secretary of State John Kerry has arrived in Geneva ahead of Sunday’s fresh round of talks with Iran over reining in its nuclear programme.

Kerry intends to have one-on-one discussions with his Iranian counterpart in order to speed things up before the resumption of negotiations by global powers known as the P5+1.

Diplomats fear time may be running out, after two earlier deadlines for an accord were missed.

American lawmakers are eager to impose new sanctions on Iran as the Obama administration has sought to hold them off, warning it could scuttle all hopes of a deal.