Loud explosions were heard in the Ukrainian capital, causing a residential building near the government district to shake, while dozens took shelter in an underground metro station in the city centre, according to AFP journalists."The capital has come under a mass ballistic missile attack," Tymur Tkachenko, head of the Kyiv City Military Administration, wrote on Telegram.Mayor Vitali Klitschko said five people had been wounded and one of them hospitalised."There are currently reports of at least 4 locations affected by the attack: Shevchenkivsky, Dniprovsky and Podilsky districts. Fires and damage to residential buildings are preliminarily reported," Tkachenko said."A strike drone attack is ongoing; the ballistic missile threat remains present. Stay in shelters!"Ukrainian authorities and the US embassy had earlier warned of a possible siginificant attack on the capital after Russia said it would "punish" those responsible for deadly strikes in a part of eastern Ukraine under its control.Klitschko said medical teams were called to the Podilsky district in Kyiv's northwest, where debris fell in a non-residential area.The attack also sparked a fire near a residential building in nearby Shevchenkivsky, he added.Missile attack warningKyiv had earlier warned it was expecting a major Russian missile attack after its own forces launched a drone barrage in the Russian-occupied east, which Moscow said hit a college dormitory and killed at least 18 people.