US concerned about Libya militia clashes The United States said Tuesday it is concerned about clashes between militias that helped topple Moamer Kadhafi, and repeated offers to help Libya merge all militias into one security force. There's been some continued fighting. We are concerned about that," State Department spokeswoman Victoria Nuland told reporters. A group of men from Libya's third-biggest city of Misrata traded anti-aircraft and heavy machine gun fire with a militia from a central Tripoli neighborhood in broad daylight, witnesses and militia commanders said. Four fighters were reported killed. The fighting raised fresh concerns over the issue of militias in Tripoli and the potential security threat they pose months after Kadhafi's ouster. "We have long supported the plans of the central authorities in Tripoli to create a central security force," Nuland said when asked about efforts to merge the militias into one force. "So we obviously support the government's efforts to continue to do that," she added. "And we have said all along that if there are specific requests that the Libyan government has of the United States, of NATO, et cetera, on how this process could go forward, we're prepared to support them," Nuland said. "We are already giving them some advice," she said. Nuland confirmed that the United States currently has no US military advisers in Libya.