Suspected rightist militias killed at least seven unarmed villagers in northern Colombia, and officials fear dozens more are dead. Yesterday’s killings followed bombings of electrical towers and bloody weekend clashes between government troops and guerrillas. Also yesterday, two hand grenades apparently thrown at a small police post in capital Bogota killed a girl and wounded five people at an adjacent school. An upsurge in Colombia’s fighting had been expected following the expiration last week of a temporary year-end truce. Meanwhile, the Clinton administration is talking about giving more than $1.6 billion to Colombia to support the military, well known for its human rights abuses in Colombia.