Libyan government says Gadhafi's son-grandchildren killed in Nato air strike

Tripoli, Libya (CNN) -- The Libyan government said Sunday that ruler Moammar Gadhafi's son and his three grandchildren died in a NATO airstrike, and vowed to retaliate with death to "invaders" in the nation.

Gadhafi and his wife were in their son's house when it was targeted, but they are in good health, government spokesman Musa Ibrahim told journalists.
In addition to Saif al-Arab Gadhafi, three of the ruler's grandchildren also died in the attack, he said.
CNN could not independently confirm the reports.

Saif al-Arab Gadhafi is one of two sons whose names begin with Saif. The 29-year-old is the sixth of his eight biological children.

Another son -- Saif al-Islam Gadhafi -- had previously touted reform, but has emerged as one of his father's most visible defenders in recent months.
The strikes destroyed the house in Tripoli, leaving a massive crater where it used to be.