NATO says it struck a government building in Tripoli but can't confirm that one of Moammar Gadhafi's sons was killed.
Sunday's statement comes hours after an airstrike that the Libya regime said killed Gadhafi's youngest son Seif al-Arab and three of the Libyan leader's grandchildren. Gadhafi escaped unharmed.
NATO says it struck a "command and control building in the Bab al-Azizya neighborhood" Saturday evening, insisting all its targets are military in nature and linked to Gadhafi's systematic attacks on the population.
Lt. Gen. Charles Bouchard says he is aware of unconfirmed reports that some Gadhafi family members may have been killed and he regrets "all loss of life, specially the innocent civilians being harmed as a result of the ongoing conflict."