A fourth round of talks between the US and Iran on Iran’s nuclear program have begun in Oman, according to Iranian state media, with the two sides aiming to overcome divisions that could scupper the tentative negotiations.

Suspected Islamist militants attacked a Nigerian army base and captured soldiers and ammunition during a raid in the insurgency-hit northeastern Borno state in the early hours of Monday, two security sources told Reuters.

A fourth round of nuclear talks between the United States and Oman have produced encouraging results for the Trump administration, a senior official told reporters Sunday.