Four blasts within minutes rocked the center of the eastern Ukrainian city of Dnipropetrovsk today, injuring at least 15 people in what prosecutors believe was a terrorist attack, officials say. The first blast occurred at a tramway stop in the center of Dnipropetrovsk, injuring five people. The second injured seven people outside a movie theater, while the third wounded three near a railway station. A fourth blast was also heard in the city center, the Interior Ministry says, but it was unclear whether anybody was injured. (More Ukraine stories.)