BBC news with Iain Purdon.

Iran has said it will not disrupt shipping in the Strait of Hormuz, moderating a threat it made last week to the busy sea route. The annoucement was made on the final day of naval exercises in the area. As James Reynolds reports.

Tens days of naval exercises in the Gulf needed a fitting

climax

, so Iran tested a new surface-to-sea missile. The military called it a long-range weapon but it's only able to hit targets within the Gulf. Iran has been keen to demonstrate its strengh within the region. Last week the country felt bold enough to suggest that it might even close the Strait of Hormuz if the west

impose sanctions on

Iran's oil industries. But Iran's navy has not tempted that threat.

Tens of thousands of South Sudanese are fleeing from their homes after inter-ethnic clashes around the town of Pibor. The United Nations is warning villagers to run for their lives ahead of advancing fighters from a rival tribe. Will Ross reports from Nairobi.

Groups of armed Lou Nuer men are continuing to attack villages in South Sudan's Jonglei state, burning homes. Tens of thousands of people from the rival Murle tribe has been

displaced

in recent days. It's difficult for the army or the United Nations to intervene as they had been seen as

partisan

in a tribal conflict that's gone for years. On Saturday parts of Pibor town were attacked. The army and UN troops protected the administrative center of the town but were powerless to prevent the distruction of homes and the only hospital there.