U.S. accuses both sides in South Sudan of blocking peace

By Denis Dumo JUBA (Reuters) - Washington accused both sides in South Sudan's two-year conflict of blocking peace efforts and protested, rebels said, by pulling funding for a flight to return their leader Riek Machar to the capital. Underlining growing international frustration over months of delays and wrangling, the U.S. State Department said South Sudan's government had as recently as Saturday refused to give landing permission to planes carrying Machar. Machar himself, the United States said