A top United Nations envoy is warning rival factions in Libya to agree to long-delayed elections, after a parallel government claimed power in the northeastern city of Tobruk on Thursday. Stephanie Williams, the U.N.'s special adviser on Libya, called on the new eastern government to form a joint committee with its rivals in Libya's capital Tripoli dedicated to reaching consensus on a constitutional framework for elections. Libya abandoned plans for presidential and parliamentary elections in December, and Prime Minister Abdul Hamid Dbeibah has refused to cede power to an elected government.