(Reuters) – Armed groups have been attacking schools in the Central African Republic and using them as bases amid persistent violence in the landlocked nation, a charity network said on Thursday. In one incident when an armed group attacked peacekeeping troops near a Bangui high school, many students were “allegedly used as human shields” and 80 children were later given medical treatment, according to Watchlist, a New York-based network of charities trying to end violations against children in conflict.