On 12 July 1960, after the UN Security Council adopted a resolution, calling on Belgium to pull out its forces and the UN to assist the Congolese government, Hammarskjöld appointed as his special representative a senior Indian diplomat: Rajeshwar Dayal, who would later become India's foreign secretary. Lumumba's assassination shocked Nehru who reacted sharply. Calling it “an international crime of the first magnitude”, he asked Hammarskjöld to take a tough line. When the Security Council passed a second resolution on 21 February 1961, Nehru agreed to send an Indian Army brigade of some 4,700 troops to the Congo. Kasavubu and Mobutu took great exception to these moves. They had all along resented Dayal's and Nehru's support for Lumumba. Now they threatened dire consequences for the UN mission if Dayal remained at its helm. At Hammarskjöld's request, Nehru agreed that Dayal should step down.