KYIV, Ukraine (AP) — Ukrainian officials say a Russian missile attack on Kyiv has resulted in more than 50 injuries and several damaged buildings. A series of loud explosions could be heard in Kyiv at 3 a.m. local time Wednesday as air defenses were activated for the second time this week. Kyiv’s mayor says debris from intercepted missiles fell in the eastern Dniprovskyi district, injuring at least 53 people, 20 of whom were hospitalized. The mayor says a residential building and several cars caught fire. On Monday, a Russian missile attack destroyed several homes on the outskirts of Kyiv and left more than 100 households temporarily without electricity.