Battle on the Sudan-South Sudan border – in pictures

Soldiers from South Sudan's army, made up largely of the Sudan People's Liberation Army (SPLA), drive in a truck on the frontline in Panakuach, Unity state Photograph: Goran Tomasevic/Reuters

An SPLA soldier sits in a truck on the frontline in Panakuach Photograph: Goran Tomasevic/Reuters

A South Sudan army commander sits in a chair in Panakuach Photograph: Goran Tomasevic/Reuters

Soldier carries water to his position on the frontline in Panakuach, Unity state Photograph: Goran Tomasevic/Reuters

SPLA soldiers rest near an oil field in Unity state Photograph: Goran Tomasevic/Reuters

South Sudanese soldiers load a Soviet-made T-72 tank into a truck in Halop, Unity state Photograph: Goran Tomasevic/Reuters

A woman runs along a road during an air strike by the Sudanese air force in Rubkona Photograph: Goran Tomasevic/Reuters

A man gestures at a Rubkona market hit in an air strike by the Sudanese air force Photograph: Goran Tomasevic/Reuters

Smoke rises after the Sudanese air force fired a missile on Rubkona, near Bentiu Photograph: Goran Tomasevic/Reuters

An SPLA soldier looks at warplanes as he takes cover beside a road during an air strike by the Sudanese air force in Rubkona Photograph: Goran Tomasevic/Reuters

Residents try to extinguish fires in the smouldering remains of the market in Rubkona Photograph: Michael Onyiego/AP

The burnt body of a boy killed during an air strike by the Sudanese air force is covered with sheets in the market Photograph: Goran Tomasevic/Reuters

Sudanese president, Omar al-Bashir, visits an oil refinery in Sudan's main petroleum centre of Heglig Photograph: Ashraf Shazly/AFP/Getty Images

Sudanese soldiers pose next to seized mortar rounds from the Sudanese People's Liberation Army of South Sudan in the oil region of Heglig Photograph: Ashraf Shazly/AFP/Getty Images

Sudanese workers inspect damage to a burnt oil processing facility in Sudan's main petroleum centre of Heglig Photograph: Ashraf Shazly/AFP/Getty Images

Sudanese president Omar al-Bashir addresses celebrating troops in Sudan's main oil centre of Heglig Photograph: Ashraf Shazly/AFP/Getty Images

Sudanese armed forces listen to a speech by Omar al-Bashir in Heglig Photograph: AP

Sudanese soldiers pose for a picture in Heglig Photograph: Ashraf Shazly/AFP/Getty Images