An explosion caused by an improvised device killed four Yemeni separatist fighters on Monday during an anti-jihadist sweep in the south of the war-ravaged country, security sources said. “Four Yemeni soldiers were killed and six others wounded in an IED explosion targeting a military vehicle” during a campaign targeting Al-Qaeda in the Arabian Peninsula (AQAP) in Abyan province, a security official told AFP. A second security source confirmed the toll. On 6 September, 21 separatist fighters and six AQAP members were killed when an attack by the jihadists punctured months of relative peace. Yem…