NATO : Rebel fighters returning from the front lines reported that their defenses were holding up under the onslaught , however . A fresh attack on rebel - held territory has killed at least 13 , they say . NATO says it is doing all it can to avoid killing civilians . NATO chief also says Gadhafi 's ` ` reign of terror '' is ending soon . Gadhafi vows not to surrender amid heavy fighting .
NATO : A fresh attack on rebel - held territory has killed at least 13 , they say . NATO says it is doing all it can to avoid killing civilians . NATO chief also says Gadhafi 's ` ` reign of terror '' is ending soon . Gadhafi vows not to surrender amid heavy fighting .