Kenya car bomb kills four in Nairobi's Pangani quarter

A car bomb has exploded outside a police station in the Kenyan capital, Nairobi, killing four people. Police were taking the occupants of the car in for questioning in the Pangani neighbourhood when it exploded, the interior ministry said. Two of those killed were police. It is unclear who was behind the blast, but Nairobi has been targeted in the past in attacks attributed to Somali al-Shabab militants, who oppose Kenya's military involvement in Somalia.