Sudan's president, wanted by an international court on war crimes charges, denounced the tribunal, the U.N. and aid agencies on Thursday as part of a new "colonialism" that aims to destabilize his country.

President Omar al-Bashir danced and waved a cane defiantly before thousands of supporters, as the arrest warrant had its first repercussions on the ground. Sudan ordered at least 11 aid agencies to leave Darfur and cease operations in retaliation for the International Criminal Court's decision to issue an arrest warrant. The groups started the process of moving out Thursday.

Aid workers warned that the expulsion order could spark a humanitarian crisis for up to 2 million people in Darfur who are directly served by the agencies, receiving food, shelter and medical supplies.

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Speaking for the first time since the warrant was issued Wednesday, al-Bashir told a Cabinet meeting that those agencies, the U.N. and the tribunal are "tools of the new colonialism" meant to bring Sudan and its resources under control.

Al-Bashir accused the aid organizations of trying to disrupt peace efforts in Darfur, profiting from the conflict and interfering with foreign investment. He said his government ordered them out of Darfur because they violated the law.

"We in Sudan have always been a target of the U.N. and these organizations because we have said, 'No,"' al-Bashir said. "We said the resources of Sudan should go to the people of Sudan."

Hasabo Abdel Rahman, the head of the government agency coordinating humanitarian affairs, also accused the aid groups cooperating with the ICC and offering the court "false" testimonies.

At least 2.7 million people in the large, arid region of western Sudan have been driven from their homes in the war between Darfur rebels and the government since 2003 — and many more depend on international aid to survive.

U.N. Secretary-General Ban Ki-moon called the order "a serious setback to lifesaving operations in Darfur." The aid groups, which included Oxfam, CARE and Save the Children, protested that they had nothing to do with the Netherlands-based ICC's decision Wednesday.

Medecins Sans Frontieres, also known as Doctors Without Borders, said its French branch was ordered expelled — a day after its Dutch section received the order to stop operating in Darfur. The United Nations agencies, which give a bulk of the food and other supplies to the aid agencies to distribute, were expected to continue working in Darfur. But it was unclear how the expulsion orders would affect supply distribution.

"The impact is going to be huge. We were assisting 600,000 people in parts in Darfur with life saving activities like water and food distribution," said Bea Spadacini, a spokeswoman for CARE based in Kenya. She said CARE's 650 employees in Sudan, a majority of which are Sudanese, stopped working Wednesday after the government revoked its license.

In the capital, Khartoum, senior U.N. officials were meeting with government officials in a last attempt to negotiate a deal to stay.

Al-Bashir, who faces charges of war crimes and crimes against humanity, is accused by the ICC of overseeing an anti-insurgency campaign in Darfur in which atrocities were carried out against civilians. At least 300,000 people have died in Darfur in the fighting, which pits ethnic African rebels against the Arab-led Khartoum government and Arab militiamen.

Appearing before tens of thousands of supporters at a Khartoum rally Thursday after the Cabinet meeting, al-Bashir warned international missions and organizations still operating the country "to respect themselves," saying they would be "humiliated" if they infringe on Sudan's sovereignty.

Al-Bashir danced and swayed with the crowd outside his Republican Palace in the biggest demonstration in Sudan in years. The crowd cheered: "Go, go, al-Bashir," and "Khartoum, rise against injustice."

"We are ready to resist colonialism," said al-Bashir, jabbing his cane in the air as he spoke. "We are ready to defend our religion."

The arrest warrant is the ICC's first against a sitting head of state. Al-Bashir has rejected the charges and his government has said it will not cooperate with the court. U.N. officials said their staff will continue to deal with al-Bashir in Sudan because he remains the president of the country.

Aid workers from the targeted groups said staff were in the process of departing Darfur, while getting clearances from security operatives on the ground. One U.N. official said the process is taking time in some cases because of security procedures. The workers and official spoke on condition of anonymity because of the sensitivity of the situation.

International groups might have drawn the president's ire in part by repeatedly criticizing China, which buys two-thirds of Sudan's petroleum exports, for not using its economic leverage to apply more pressure on al-Bashir's government.

China's Foreign Ministry spokesman Qin Gang told a news conference Thursday that China backs a call by the African Union and Arab countries to have any prosecution of al-Bashir deferred.

"China opposes anything that could disrupt efforts to realize peace in Darfur and in Sudan," he said.

Many in Darfur fear that Khartoum will lash out in retaliation for the warrant, increasing violence in the region. Observers also worry the warrant could hike tensions in Sudan's other main conflict, between north and south, straining a fragile peace deal in place since 2005.

Al-Bashir on Thursday made a thinly veiled warning against anyone who tries to help the ICC arrest him.

"We will act as a responsible government," he said. "But we will be responsible and firm with anyone who tries to get at the stability, security in the country or whoever uses their position and presence in Sudan to violate the law, stability and security."