Indian authorities announced on Sunday the arrest of a man who they believe to be involved in a car blast in Delhi last week , where 10 people were killed and at least 20 were injured. Officials said they were treating the blast as a "terrorist incident," caused by a "suicide bomber." They have identified the driver of the vehicle that exploded as a resident of Kashmir. The man is believed to be an assistant professor in general medicine at a university in the northern state of Haryana. Control