A Kenyan police officer shot dead six people in a rampage through the capital, Nairobi and then shot and killed himself, police said. The officer first shot and killed his wife at their home before setting off with his service-issued AK-47 rifle to shoot dead another five people, police said in a report. They did not say what had caused the rampage. "The officer ... went on a shooting spree where he shot and killed five people including two boda boda (motorcycle) riders one who died while undergoing treatment," police said in the report. Francis Wahome, the officer in charge…