On January 10 1979, the Vietnamese installed Heng Samrin as head of state in the new People's Republic of Kampuchea (PRK). The Vietnamese army continued its pursuit of Pol Pot's Khmer Rouge forces. At least 600,000 Cambodians displaced during the Pol Pot era and the Vietnamese invasion began streaming to the Thai border in search of refuge. The international community responded with a massive relief effort coordinated by the United States through UNICEF and the World Food Program. More than $400 million was provided between 1979 and 1982, of which the United States contributed nearly $100 million. At one point, more than 500,000 Cambodians were living along the Thai-Cambodian border and more than 100,000 in holding centers inside Thailand.
