A suicide attack Tuesday against a checkpoint in eastern Libya killed at least two militiamen loyal to strongman Khalifa Haftar, a security source said. The attack south of the city of Ajdabiya comes after the Islamic State group claimed a string of deadly assaults against roadblocks run by Haftar's self-styled Libyan National Army (LNA). In another incident armed men also stormed another checkpoint some 150 kilometres (90 miles) away and kidnapped one of the militiamen deployed at the location, the militia security source said.