At least 4 killed by airstrikes in Kharkiv overnight, authorities say
Ukraine's second-largest city, Kharkiv, was hit with several powerful airstrikes overnight that killed at least four people, local authorities said Thursday.
Russian bombardment have destroyed 280 civilian buildings in Kharkiv, including schools and kindergartens, since Russia began invading Ukraine on Feb. 24, according to the regional interior ministry department in Kharkiv.
Kharkiv has come under heavy attacks as Russian forces try to seize the city.
-ABC News' Patrick Reevell