WASHINGTON: US prosecutors are accusing two senior Syrian officials of overseeing a notorious prison that tortured peaceful protesters and other political prisoners, including a 26-year-old American woman who was later believed to have been executed. The indictment was unsealed Monday, two days after a shock rebel offensive overthrew Syrian President Bashar Assad. The US, UN and others accuse him of widespread human rights abuses in a 13-year battle to crush opposition forces seeking his removal from power.