A roadside bomb ripped through a vehicle in eastern Afghanistan, killing a woman, her two newborn babies and the children's grandmother, an official said. The father of the twins and the vehicle's driver also were wounded in Sunday's blast in Mandozayi district, Khost province, said Jamal Arsallah, the province's governor. The twins were born on Saturday and the family was taking them back to their village, Arsallah said. It was not immediately clear why the vehicle was targeted. Militants usually use roadside bombs to attack Afghan and foreign troops on patrol.