Sudan’s parliament voted unanimously on Monday to brand the government of South Sudan an enemy, after southern troops invaded the north’s main oilfield.

Sudan's parliament voted unanimously on Monday to brand the government of South Sudan an enemy, after southern troops invaded the north's main oilfield.

According to AFP news agency, the vote came as South Sudan accused Khartoum of fresh airstrikes that killed 10 civilians and also hit a United Nations peacekeeping camp, on the seventh day of the most severe border fighting since South Sudan separated last July with hope for a peaceful future.

"The government of South Sudan is an enemy and all Sudanese state agencies have to treat her accordingly," the parliament's resolution said.

After the vote, parliamentary speaker Ahmed Ibrahim El-Tahir called in the legislature for the overthrow of the Sudan People's Liberation Movement (SPLM) which rules the South.

"We announce that we will clash with SPLM until we end her government of South Sudan," he said.

Fighting broke out last month between the rival armies of Khartoum and Juba around Sudan's main oilfield, called Heglig.

The clashes escalated last week with waves of aerial bombardment hitting the South, whose troops on Tuesday seized Heglig from Khartoum's army.

Although South Sudan disputes that Heglig belongs to Sudan, AFP reported that the area is not among the roughly 20 percent of the border officially contested.

In the Southern capital Juba, Information Minister Barnaba Marial Benjamin said the vote by Sudan's parliament was "unfortunate".

"We have never been their enemy -- our position is that we don't consider them as our enemy," he told reporters.

Fresh bombing raids on Sunday killed 10 civilians in South Sudan's Unity border state, said the area's information minister, Gideon Gatpan.

However, China said Monday that South Sudan's President Salva Kiir will visit from April 23 to 28 for talks with Chinese President Hu Jintao.

Beijing is an ally of the Sudanese government and the largest buyer of South Sudan's oil. Last week it called on both sides to enact a ceasefire and return to the diplomacy table.

Other world powers have also called for restraint and voiced deep concern at the escalating violence.

Khartoum seeks the South's unconditional withdrawal from Heglig. But Juba has said it will not pull back unless Khartoum removes its troops from the contested Abyei region nearby, among other conditions.