United Nations  - The world reacted cautiously on Monday after the International Criminal Court urged the arrest of Sudan's President Omar al-Bashir on genocide charges, a move welcomed with glee by Darfur rebels. UN chief Ban Ki-moon said he expects the Khartoum government to guarantee the safety of United Nations peacekeepers, and the United States said it would review the ICC arrest warrant request, urging all parties to stay calm. "The secretary general expects that the government of Sudan will continue to cooperate fully with the United Nations in Sudan, while fulfilling its obligation to ensure the safety and security of all United Nations personnel and property," Ban's office said in a statement. US National Security Council spokesman Gordon Johndroe said: "We urge all sides to remain calm. We will monitor the situation in The Hague and review what the prosecutor has requested, but we are not a part of the ICC." French Foreign Minister Bernard Kouchner urged Sudanese President Omar al-Bashir Monday to "respect" the decisions of the International Criminal Court, after its chief prosecutor applied for an arrest warrant on genocide charges. US President George W. Bush is "gravely concerned" by increasing violence in Darfur and the United States is examining ways to boost peacekeeping efforts there, the White House said Monday. "The president said he is gravely concerned by the increased insecurity in Darfur," press secretary Dana Perino said after Bush held talks with his special envoy for Sudan. "The president said he was troubled that nearly one year after the passage of a Security Council resolution that authorized a peacekeeping force for Darfur, that force is still not fully deployed," she said. ICC prosecutor Luis Moreno-Ocampo accused Bashir on Monday of masterminding a genocidal campaign in Sudan's strife-torn western region of Darfur. "What happened in Darfur is a consequence of Bashir's will," Moreno-Ocampo told journalists in The Hague. He asked the court for an arrest warrant for Bashir on 10 charges of genocide, crimes against humanity and war crimes. It was the first time the court has targeted a sitting head of state and the first time it has charged anyone with genocide. Moreno-Ocampo's bold move came despite fears it could deepen tensions in Darfur and lead to the expulsion of aid workers and peacekeepers there. But Darfur rebels reacted with delight, with a faction of the rebel Sudan Liberation Army calling it a "victory for humanity in Darfur" and the "beginning of liberty in the Sudan." The rebels are ready "to carry out any tasks to arrest and extradite war criminals to the international court," SLA spokesman Mahgoub Hussein said in a statement. A field commander with the Justice and Equality Movement (JEM), which in May came within shooting distance of Bashir's presidential palace in Khartoum, said his fighters in Darfur were celebrating the news. "We have been waiting for this moment for a long time, so today we are celebrating, we are very happy," he told AFP by satellite telephone. The African Union said the ICC arrest warrant request could undermine peace efforts in Sudan, however. "The AU's position is that nothing should be done that might jeopardise the peace processes in Sudan," said El-Ghassim Wane, spokesman for the AU commission, the pan-African organisation's main executive body. On July 8 suspected militiamen backed by the Sudan government ambushed a UN convoy in Darfur, killing seven peacekeepers and wounding more than 20, in the deadliest attack to the six-month-old mission. The peacekeeping force known as UNAMID, severely under-equipped and under-manned, has suffered a string of attacks since it assumed control from an African Union force. Moreno-Ocampo said the prosecution had collected evidence showing that Bashir's target groups, some 2.5 million people in camps for those displaced by war, were being attacked with the aim of elimination. "Three main weapons are used to attack them in the camps: rape, hunger, fear," he said. In reaction, EU Development Commissioner Louis Michel said it was "important to bring an end to the impunity surrounding the crimes" committed in Darfur and blasted Khartoum's "flagrant" lack of cooperation with the ICC. Speaking before the ICC announcement, British Prime Minister Gordon Brown urged Sudan to cooperate with the court. "The International Criminal Court has our support for its activities," he told a news conference in London. The Egypt-based Arab League announced an emergency meeting of Arab foreign ministers for Saturday, while the Saudi-based Organisation of the Islamic Conference expressed "deep concern" ahead of the ICC move. Khartoum, which rejects the ICC's jurisdiction and refuses to surrender two war crimes suspects already named, has warned that the move could threaten peace efforts.