Suicide attack escalates Libya violence, oil output slips

BENGHAZI Libya (Reuters) - A twin suicide bombing at a Libyan army base in Benghazi killed at least four solders in an escalation of clashes between Islamist militants and regular forces battling to oust them from the eastern city.

A first attacker blew himself up at the entrance to Benghazi's special forces headquarters, allowing a second suicide bomber to detonate his explosives at the base and kill at least four troops, a security source said.