Dozens of unknown assailants attacked a U.N. refugee camp in western Burundi, shooting and hacking to death at least 150 Congolese refugees, witnesses and local officials said Saturday. An additional 30 people died in the hospital following the late Friday attack on the refugee camp near the border with Congo, said Isabelle Abric, spokeswoman of the U.N. mission in Burundi. "It is too early to identify the attackers," Abric told told The Associted Press. "Some 150 people were killed on the spot and another 100 people were wounded and brought to hospital in (the Burundian capital in) Burumbura and we have learned that an additional 30 people died in hospital." The assailants raided the camp late Friday, screaming war cries and torching a refugee camp in Gatumba, 20 kilometers (12 miles) from the Congolese border town of Uvira, Louis Niyonzima, a local official, told The Associated Press. The camp sheltered Congolese ethnic Tutsi refugees, known as the Banyamulenge, who fled fighting in the country's troubled border province of South Kivu, Niyonzima said.