More than 330 people have been killed in heavy fighting since Islamic State group militants first attacked a prison in northeast Syria, a war monitor said on Sunday. The IS fighters on 20 January launched their biggest assault in years on the Ghwayran prison in the Kurdish-controlled city of Hasakeh, aiming to free fellow jihadists, and dozens remained holed up inside on Sunday. The death toll in fierce clashes since then rose to 332 as the US-backed Syrian Democratic Forces (SDF) found over 50 more bodies overnight in prison buildings and nearby areas, the Syrian Observatory for Human Rights …