Nearly a dozen people have been killed and many more injured in a fresh attack in Pakistan\'s port city of Karachi. Officials say an explosive-laden car hit a police bus transporting over 50 personnel. All of the victims are policemen. No group has claimed responsibility for the early morning attack. Pakistan has been hit by a wave of bombings and shootings in recent months. And Karachi has been one of the major targets with insurgent groups often trying to create ethnic violence in the city. Just days ago, several people were killed after a group of gunmen threw grenades and opened fire at a religious gathering there. Show Less >>