Peacekeepers knew of likely raid on Abiemnom, where more than 200 people were killed, according to rights group report. peacekeepers had weeks of warning before an attack killed more than 200 people in South Sudan but failed to do enough to protect civilians. Amnesty International says South Sudanese authorities and the U.N. peacekeeping mission had advance warning but failed to prevent a March attack on Abiemnom that killed more than 200 people.