The bombing of a house in northwestern Colombia killed a 65-year-old man and his 5-year-old grandson, authorities said Tuesday. The man's wife was seriously wounded in the blast, which Colombian military officials blamed on the Revolutionary Armed Forces of Colombia (FARC). The attack took place in the town of Granada in Antioquia province. FARC has repeatedly threatened people who cooperate with security forces in northwestern Colombia. --SP 2304 Local Time 2004 GMT