BRUSSELS (AP) — Belgium has arrested a high-ranking member of the rebel movement that plunged Liberia into conflict more than two decades ago and charged her with war crimes and crimes against humanity, a spokesman for federal prosecutors said Thursday.

The charges against Martina Johnson, former head of the heavy artillery unit for the National Patriotic Front of Liberia, are believed to be the first against a Liberian for international crimes committed during the country’s first civil war.