In September, Machar and 20 co-defendants from his Sudan People's Liberation Movement/Army-in-Opposition (SPLM/A-IO) party were indicted on charges of terrorism, treason, and crimes against humanity for their alleged role in a March attack on a military garrison that the government says killed more than 250 soldiers. Machar has denied the charges while the SPLM-IO has called the accusations baseless and politically motivated.