Allegations that Saddam Haftar, deputy commander of the eastern-based Libyan National Army and son of warlord Khalifa Haftar, oversaw a cell behind August drone strikes on fuel storage and power facilities in western Libya have thrown US-backed unification plans into doubt. Sources in the Tripoli-based government of national unity say it is now "impossible to work with Saddam" after arrests of Libyan and Spanish suspects in an alleged plot that included an attack on Tripoli airport, though no formal decision has been made. The fallout threatens both Washington's plan to merge Libya's rival east and west governments and a UN-sponsored process that agreed in August to hold elections within two years, in a country divided since Muammar Gaddafi's fall in 2011.