Sudan President Omar al-Bashir has said his main goal is now to "liberate" the people of South Sudan from its rulers following recent border clashes.

The former rebel Sudan People's Liberation Movement has ruled South Sudan since it seceded from Sudan in July 2011.

President Bashir was addressing a rally at his party's headquarters.

Fighting between the two countries has now spread to another area, further adding to fears of all-out war.

South Sudan seized the Heglig oil field - generally recognised as Sudanese territory - eight days ago. On Tuesday fighting broke out north of Aweil in South Sudan, about 100 miles (160km) west of Heglig.